The Three Types Of Impulse Turbine Engineering Essay

The Three Types Of Impulse Turbine Engineering Essay A turbine is a rotary engine that extracts energy from a fluid or air flow. The simplest turbines have one moving part, a rotor assembly, which is a shaft with blades where the moving fluid acts on the blades, or the blades react to the flow, so that they rotate and impart energy to the rotor. Examples of early turbines are windmills and water wheels. Turbines usually have a casing around the blades that contains and controls the working fluid. Working fluid contains kinetic energy (velocity head) and potential energy (pressure head) and these working fluids may be compressible or incompressible. A compressor or pump is a device similar to a turbine but operating in reverse. The turbines produce almost all electric power on Earth. Most jet engines rely on turbines to supply mechanical work from their working fluid and fuel as do all nuclear ships and power plants. Aircraft engines also use the turbine powered by their exhaust to drive an intake-air compressor, a configuration known as a turbocharger (turbine supercharger). Turbines could also be used as powering system for a remote controlled plane that creates thrust and lifts the plane of the ground. They are as small as soda can, yet still strong enough to move objects with a weight of 100kg. THE TURBINE PROCESS If high-velocity steam is blown on to a curved blade and the steam direction changes as it passes across the blade. The steam will impart a force to the blade as a result of its change in direction across the blade. Now if the blades were free, it would move off in the direction of the force. The principle of steam turbine is where a number of blades were fixed around the circumference of a disc and the disc is free to rotate on a shaft. Steam is then blown across the blades which cause the disc rotates. To increase the rigidity of the blades, the top of the blades are connected together. By means of the nozzles, the high pressure steam is made to give up some of its energy to produce a large increase in kinetic energy of the steam. The steam thus leaves the nozzles at a high velocity. It passes from the nozzles over the blades and thus the turbine disc rotates. The power is then generated at the shaft. The number of nozzles which are in use act as a load to the turbine and so the hi gher the load requires that more steam must be used to sustain the load. Therefore, more nozzles are put into the used. The turbine described is a simple turbine which is also known as de Laval turbine. This type of turbine usually rotates at a very high speed and this high speed will produce a centrifugal force. This turbine is usually small in size and, hence produces small power output. Due to the high speed of rotation, a direct drive between drive between the turbine disc and external equipment is not generally possible. For this reason, a reduction gear box is installed between and turbines of the turbine disc and external equipment. A problem in steam turbine development has been to reduce the speed of rotation and at the same time to make full use of the energy in the steam, thus larger size and higher power output is produce. There are two basic types of turbines which is the impulse turbine and the reaction turbine. THE IMPULSE TURBINES These turbines change the direction of flow of a high velocity fluid jet and the resulting impulse spins the turbine and leaves the fluid flow with diminished kinetic energy. The pressure in the fluid of the turbine rotor blades remains constant. Before reaching the turbine the fluids pressure head is changed to velocity head by accelerating the fluid with a nozzle. Impulse turbines do not require a pressure casement around the runner since the fluid jet is prepared by a nozzle prior to reaching turbine. The transfer of energy for impulse turbines uses the Newtons second law. There are three different types of impulse turbines which are the Velocity compounding turbine Pressure compounding turbine Pressure-velocity compounding turbine THE REACTION TURBINES These turbines develop torque by reacting to the fluids pressure or weight. The pressure of the fluid changes as it passes through the turbine rotor blades. The reaction turbines require a pressure casement to contain the working fluid as it acts on the turbine stage or the turbine must be fully immersed in the fluid flow (wind turbines). The casing contains and directs the working fluid and, for water turbines, maintains the suction imparted by the draft tube. Multiple turbine stages may be used to harness the expanding gas efficiently for compressible working fluids. The transfer of energy in the reaction turbine uses the Newtons third law. Purple Moving blades Blue Velocity Red Pressure Brown Fixed blades THE VELOCITY COMPOUNDING TURBINE IN IMPULSE TURBINES Steam is expanded in a single row or nozzles in this type of turbine. The high velocity steam leaving the nozzles passes on the first row of the moving blades where its velocity is only partially reduced. Then, the steam leaving the first row of moving blades passes into a row of fixed blades mounted in the turbine casing and this row of fixed blades serves to redirect the steam back to the direction of motion such that it is suitable for entry to the second row of moving blades. The steam velocity reduces partially in the second row of the moving blades. A slower turbine is resulted due to only part of the velocity of the steam is used up in each row of the blades. Blue Velocity Red Pressure Green Nozzle Purple Moving blades THE PRESSURE COMPOUNDING TURBINE IN IMPULSE TURBINES The steam enters a row of nozzles where its pressure is only partially reduced and its velocity is increased in this type of turbine. The high velocity steam passes to a row of moving blades where its velocity is reduced. The pressure is again partially reduced and its velocity is again increased when the steam passes into a second row of nozzles. The high velocity steam is then passed to a second row of moving blades where its velocity is again reduced. Next, the steam then passes into a third row of nozzles and so on. All pressure drops occur in the nozzles but the pressure remain constant in each turbine stage. The turbine run slower since steam velocities will not be so high due to only part of the pressure drop occurs in each stage. All stages, however, are coupled to the same shaft, with the result that there is no loss of output. Green Nozzle Purple Moving blades THE PRESSURE-VELOCITY COMPOUNDING TURBINE IN IMPULSE TURBINE A combination of the pressure compounding turbine and the velocity compounding turbine will give a pressure-velocity compounding turbine. In this type of turbine, the steam is partially expanded in a row of nozzles where its velocity is increased. The steam then enters a few rows of velocity compounding turbine and then to a second row of nozzles where its velocity increases. The steam then enters another few rows of velocity compounding turbine and so on. All the pressure at the nozzles decreases. Generally, the diameter from the inlet to the exhaust increases in all multistage turbines. This is because the specific volume increases as the pressure of steam falls. A greater area will be required to pass the steam for continuity of mass flow and this can be done by either increasing the diameter of the turbine discs or increasing the height of the blades. A greater area will be required to pass the steam in order to preserve the mass flow if there is depreciation in velocity. Blue Velocity Red Pressure Green Nozzle Brown Fixed blades Purple Moving blades DIFFERENCES OF THE TURBINES There are many differences that can be stated between the 3 types of impulse turbine. The 3 types of impulse turbine are the: Velocity compounding Pressure compounding Pressure-velocity compounding The differences between these turbines can be classified in terms of: Structure of the turbine The process of the turbine The pressure change in the turbine The velocity change in the turbine Structure of the turbine The structure of the velocity compounding turbine is it consists of a turbine then to a moving blade and a fixed blade. The structure then continues with a second row of moving and fixed blades. The structure of the pressure compounding turbine is it starts from a turbine and then to a moving blade then to a second row of turbine and moving blades and so on. Besides that, the structure of the pressure-velocity compounding turbine is the combine of both of the structure of the velocity compounding turbine and pressure compounding turbine. The process of the turbines High velocity steam from the nozzles passes thru the moving blades then to the fixed blade and the second row of moving and fixed blade in the velocity compounding turbine. In the pressure velocity turbine, the high velocity steam from the nozzles passes thru a moving blades and the low velocity of steam enters another turbine and then to a second row of moving blades and so on. Whereas in the pressure-velocity compounding turbine, the steam from the turbine enters a row of moving blades then a fixed blade and then another row of moving blades. The steam finally then enters another turbine and the process is repeated. The pressure change in the turbine The pressure in the velocity compounding turbine remains constant throughout. In the pressure compounding turbine, the pressure decreases partially when it passes the rows of turbine. Furthermore, the pressure in the pressure-velocity compounding decreases partially then it passes thru the row or turbine and remains constant until the second row of turbine where the pressure decreases partially again. The velocity in the turbine The steam velocity reduces partially in the rows of the moving blades in the velocity compounding turbine. A slower turbine is resulted due to only part of the velocity of the steam is used up in each row of the blades. Whereas in the pressure compounding, the velocity decreases partially when its pass thru the blades but increases back when passing the nozzles. Finally, in the pressure-velocity compounding turbine, the velocity decreases in the turbine and remains constant when passing the blades. The velocity is again decreased when passes thru a second row of turbine. CONCLUSION The steam turbine has greatly improved the energy conversation in our daily lives. There are still future developments oh the steam turbines in order to improve efficiency. Development are now developing turbine which requires a smaller input but produces a bigger output.

How to Make Strawberry Bannana Pancakes Essay

Is it early in the morning and your really hungry? Well there is a solution for that. By making the best Strwaberry Bannana Pancakes you ever had. There are very easy to make, and every one loves them. It only takes about fifteen easy minutes the most to make the pancakes. To Make Strawberry Bannana Pancakes the first thing you will need of course is strawberry’s and bannana’s. Next you will need flour, milk, butter, and a mixer. Then you will need a knife a stove, and a spachula. Finally you will need a plate and syrup. These are all the things that you need to make strawberry bannana pancakes. So this is the first step to make these delicious pancakes. Now that you have all the ingredients to make these delicious pancakes, you can now start. First of all you need a mixer. Then you pour the pancake mix, butter, and milk in the mixer bowl. So you put those three things in the mixer and press the power button to turn the mixer on. Now you have to wait about two minutes or until the batter looks kind of thick. Next you turn on the stove and put it on medium so not to hot or to low. Then you put the pan on the stove and let it heat up for about thirty seconds. After the pan heats up you pour the pancake batter on the pan and try to make like a little circle, so the shape can be like a pancake. Then you cut the strawberry’s and bannana’s and cut them in to little pieces. After you cut them up you can put the strawberry’s and bannana’s on to the pancake and let it cook with the pancake. Finally, you will see that the pancake’s are cooked and look delicious. Then you get your spachula and get the pancake’s and put it on your plate. Now you can add the final touch and put any kind of syrup you want on your pancake’s. After that you get your knife and fork and cut your pancake in to pieces and you will see the strawberry’s and bannana’s inside. Now you can finally eat them and enjoy your amazing Strawberry Bannana pancakes. I have finally taught you how to make these pancake’s step by step. Now that you know how to make these pancake’s you can enjoy them any time of the day, it doesn’t always have to be breakfest. I hope you loved the pancake’s, and every time you make them dont forget to add syrup at the end so the pancake’s could have a little taste of sweetness. So i taught you today every little thing of makinng strawberry bannana pancake’s. I hope you dont forget how to make the best pancake’s ever.

United States Should Not Be The Best Essay - 1287 Words

Americans consider their county to be the best. America helps other countries in need of assistance after a natural disaster or feed hungry Africans that are without food. There is a problem here, why do Americans help other countries when Americans are suffering. Families are starving, even parents forgoing eating so their children can. One group that can help is the top one percent in the United States. They have large amounts of money, why can’t they give any away? They use their money to boost their profits instead by underpaying employees to other countries, avoiding taxes through loopholes and tax havens and outsourcing jobs to other countries. The money they send away could be used for government funded programs like food stamps and unemployment or they could donate to food banks. There is a plethora of ways big business is damaging our own economy and it is starving our people. The main goal of a business is to break even, spending about the amount as profits gained, or gain a net profit and expand. While expanding is expensive, companies will attempt to outsource jobs to different countries for a cheaper cost . Outsourcing is an issue for multiple unemployed and employed Americans, where the businesses could be supporting families by creating jobs for those who need them. Flatworld solutions, a company made to help businesses outsource jobs, would argue, â€Å"You can get your job done at a lower cost and at better quality as well† (Flatworld). It does lower the cost,Show MoreRelatedWhat Are The Best Policies The United States Should Implement956 Words   |  4 PagesWhat are the best policies the United States should implement to solve the illegal immigration problem? Immigration is an important implication throughout the United States as a whole. This topic drafts many opinions, both positive and negative. 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Business Overview of Harley-Davidson Free Essay Example, 2000 words

There are four main learning characteristics present in the context of organizational culture. These comprise information is shared as well as accessible , learning is emphasized by values , mistakes or failures are not punished and people are expected to learn constantly. With the help of these learning characteristics, organisations can develop a strong culture between employee and managerial team of a company (Bauschard, n.d. ). The managerial team of H-D is identified to pay the utmost focus on the valued learning process. Top-bottom level employees of the company constantly learn new business concepts from such processes. According to the modern business trend, the company has developed new models to attain more customers of different age groups. On the other side, the managerial team did not take into concern sharing valued information with its employees and vendors (America City Business Journals, 2014). From the above analysis and discussion, it can be ascertained that with the proper formation of an effective organizational culture, companies like H-D can attain their predetermined targets at large. Moreover, proper leadership traits may help the company to achieve future goals and motivate its employees for better performance. We will write a custom essay sample on Business Overview of Harley-Davidson or any topic specifically for you Only $17.96 $11.86/pageorder now Ethical organizational characteristics are another key to strengthen the relationship with the vendors. Justifiably, every ethical characteristic makes the organization as well as the employees more improved and effective for future performance. As a successful motorcycle-manufacturing brand, H-D did not follow its objectives properly. For this particular reason, the company faced an industrial dispute with its workforce. To improve the productivity level of the employees, the management team needs to implement a team-oriented structure for reducing inter and intra team conflicts. With the help of a team-oriented structure, the managerial team of the company can improve workplace culture and environment.