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Consider the following figure Otto cycle Heating at constant volume (fuel combustion) Он 3) Adiab...
Ignition power stroke adiabatic expansion compression stroke adiabatic compression Pressure 4. (25 pts) in an internal...
Ignition power stroke adiabatic expansion compression stroke adiabatic compression Pressure 4. (25 pts) in an internal combustion engine, the compression ratio (c), or the ratio volumes in an expansion or compression step, is an important for calculating efficiency. An Otto Engine cycle consists of (see diagram to right): an adiabatic compression step (1-2), a constant volume heating step (2-3). an adiabatic expansion step (3-4), and a constant volume cooling step (4-1). Based on this information, show: a. V3/V4 = V2/...
The ideal Otto cycle, shown in the figure above, is the cycle used by gasoline engines...
The ideal Otto cycle, shown in the figure above, is the cycle used by gasoline engines to generate useful work. It consists of an adiabatic compression from step 1 to 2, followed by an isochoric increase in pressure from step 2 to 3, followed by an adiabatic expansion from 3 to 4, and finally an isochoric decrease in pressure from step 4 to 1.Consider an Otto cycle that works on a monoatomic ideal gas (γ= 5/3,cV= 3R/2), initially at a...
16 5 points Which of the following processes complete the Otto thermodynamic cycle used in vehicles...
16 5 points Which of the following processes complete the Otto thermodynamic cycle used in vehicles that use gasoline as fuel: constant volume heat addition constant pressure heat addition constant pressure heat rejection to cooling tower isentropic compression of gas or vapor isentropic compression of liquid o O isentropic expansion U heat rejection by an exchange of a constant volume with ambient air 17 5 points Which of the following processes complete the Rankine steam thermodynamic cycle used in power...
Q1 Otto Cycle Bookwork Question An air standard Otto cycle:- 1. Draws air from the environment...
Q1 Otto Cycle Bookwork Question An air standard Otto cycle:- 1. Draws air from the environment at 100 kPa and 5°C. 2. The cycle has a compression ratio of 9.2: 1. 3. Heat (880 kJ/kg) is added to the compressed gases at constant volume. 4. The working fluid is air, a perfect gas with ratio of specific heats y = 1.4 and gas constant R = 287 J/kgk. Follow the instructions below: a) Describe each of the four processes from...
Q6. (a) Using appropriate diagrams to support your answer: (i) Briefly describe the Otto cycle [3...
Q6. (a) Using appropriate diagrams to support your answer: (i) Briefly describe the Otto cycle [3 marks] (ii) Briefly describe the actual spark ignition engine cycle [3 marks] (iii) Discuss the differences between i and ii above. [4 marks] (b) 1 kg of air is taken through constant volume cycle. At the commencement of the adiabatic compression, the pressure and temperature are 90 kN/m² and 20°C, respectively. The adiabatic compression has a volume ratio of 7.5:1. The maximum pressure of...
Consider the effects of exhaust gas recirculation on the combustion process. Mixing exhaust gas with the...
Consider the effects of exhaust gas recirculation on the combustion process. Mixing exhaust gas with the fuel-air gas changes the initial temperature, density, molecular weight and effective heat of combustion of the charge within an SI engine. Consider an SI engine with compression ratio 9 which uses fuel-air mixture of the equivalence ratio 1.1. The fuel-air mixture enters the intake manifold at a pressure p1 and temperature 290K. Perform an analysis of the effect of EGR on an ideal cycle....
Consider a Carnot cycle in which the working substance is 0.10 mol of perfect gas molecules,...
Consider a Carnot cycle in which the working substance is 0.10 mol of perfect gas molecules, the temperature of the hot source is 373 K, that of the cold sink is 273 K; the initial volume of gas is 1.00 dm', which doubles over the course of the first isothermal stage. For the reversible adiabatic stages it may be assumed that VT3/2 = constant. a) calculate the volume of the gas VB and Vc); b) calculate the volume of the...
7.5) A 1.15 -mol quantity of monatomic ideal gas undergoes the following cyclic process. The gas...
7.5) A 1.15 -mol quantity of monatomic ideal gas undergoes the
following cyclic process. The gas starts at point a at STP. It
expands isothermally to point b, where the volume is 2.2 times its
original volume. Next, heat is removed while keeping the volume
constant and reducing the pressure. Finally, the gas undergoes
adiabatic compression, returning to point a.
a. Calculate the pressures at b and c. (answers in Pa)
**Find the volumes at a and b first.
**Use...
PA AQi T =Th AQ19 2 4 3 AQout T= Te V Figure 1: Pressure-volume diagram of the Stirling cycle. (a) A Stirling cycle...
PA AQi T =Th AQ19 2 4 3 AQout T= Te V Figure 1: Pressure-volume diagram of the Stirling cycle. (a) A Stirling cycle consists of two isothermal processes and two isochoricprocesses as shown in Fig. J. The hot reservoir is at temperature T and the cold-reservoir AS at temperaturé T)You may assume that the working fluid is anideal gas with Llegrees of freedom. The compression ratio V2/Vi)i.e. the ratio of the volume of the gas at state 2 to...
The figure shows a Carnot cycle. Starting from (a), the gas is compressed at constant temperature...
The figure shows a Carnot cycle. Starting from (a), the gas is compressed at constant temperature to (b), is compressed adiabatically to (c), is expanded at constant temperature to (d), and expanded adiabatically back to (a). The engine works between the temperatures Tc = 293 K and Th=430 K. The engine starts at (a) with a volume of 2.7 Land atmospheric pressure, 1.01 X 105 Pa. Assume this is a diatomic ideal gas (air, to a good approximation). What is...
Ignition power stroke adiabatic expansion compression stroke adiabatic compression Pressure 4. (25 pts) in an internal combustion engine, the compression ratio (c), or the ratio volumes in an expansion or compression step, is an important for calculating efficiency. An Otto Engine cycle consists of (see diagram to right): an adiabatic compression step (1-2), a constant volume heating step (2-3). an adiabatic expansion step (3-4), and a constant volume cooling step (4-1). Based on this information, show: a. V3/V4 = V2/...
16 5 points Which of the following processes complete the Otto thermodynamic cycle used in vehicles that use gasoline as fuel: constant volume heat addition constant pressure heat addition constant pressure heat rejection to cooling tower isentropic compression of gas or vapor isentropic compression of liquid o O isentropic expansion U heat rejection by an exchange of a constant volume with ambient air 17 5 points Which of the following processes complete the Rankine steam thermodynamic cycle used in power...
Q1 Otto Cycle Bookwork Question An air standard Otto cycle:- 1. Draws air from the environment at 100 kPa and 5°C. 2. The cycle has a compression ratio of 9.2: 1. 3. Heat (880 kJ/kg) is added to the compressed gases at constant volume. 4. The working fluid is air, a perfect gas with ratio of specific heats y = 1.4 and gas constant R = 287 J/kgk. Follow the instructions below: a) Describe each of the four processes from...
Q6. (a) Using appropriate diagrams to support your answer: (i) Briefly describe the Otto cycle [3 marks] (ii) Briefly describe the actual spark ignition engine cycle [3 marks] (iii) Discuss the differences between i and ii above. [4 marks] (b) 1 kg of air is taken through constant volume cycle. At the commencement of the adiabatic compression, the pressure and temperature are 90 kN/m² and 20°C, respectively. The adiabatic compression has a volume ratio of 7.5:1. The maximum pressure of...
Consider a Carnot cycle in which the working substance is 0.10 mol of perfect gas molecules, the temperature of the hot source is 373 K, that of the cold sink is 273 K; the initial volume of gas is 1.00 dm', which doubles over the course of the first isothermal stage. For the reversible adiabatic stages it may be assumed that VT3/2 = constant. a) calculate the volume of the gas VB and Vc); b) calculate the volume of the...
PA AQi T =Th AQ19 2 4 3 AQout T= Te V Figure 1: Pressure-volume diagram of the Stirling cycle. (a) A Stirling cycle consists of two isothermal processes and two isochoricprocesses as shown in Fig. J. The hot reservoir is at temperature T and the cold-reservoir AS at temperaturé T)You may assume that the working fluid is anideal gas with Llegrees of freedom. The compression ratio V2/Vi)i.e. the ratio of the volume of the gas at state 2 to...
The figure shows a Carnot cycle. Starting from (a), the gas is compressed at constant temperature to (b), is compressed adiabatically to (c), is expanded at constant temperature to (d), and expanded adiabatically back to (a). The engine works between the temperatures Tc = 293 K and Th=430 K. The engine starts at (a) with a volume of 2.7 Land atmospheric pressure, 1.01 X 105 Pa. Assume this is a diatomic ideal gas (air, to a good approximation). What is...
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