c) To examine the behavior of turbocharging, we shall consider the following example of a four stroke 2.0 L displacement passenger car diesel engine turbocharged with a single stage centrifugal compressor, and a single stage turbine. For simplicity, there is no waste-gate and no inter-cooler. You may assume the following: 1. The ambient conditions are T1=300K and Pi=1 bar. The working fluid may be assumed to have constant properties of y = 1.35 and molecular weight of 29. 2. The turbine and compressor have constant efficiencies: ni= 0.85 and ne = 0.65. You may also assume that the Mach no. is small so that the kinetic energy of the fluid is negligible. 3. The compressor and turbine maps are shown in the accompanied figures. (For this simplified example, ignore the actual values of the ŋe contours on the compressor map and assume ne to be constant.) 4. The reference conditions of these maps are the same as the ambient conditions: Tref= T1; Pref= Pi. 5. The engine volumetric efficiency based on the intake manifold condition is constant: nv= 0.8. 6. The heating value of the diesel fuel is 43 MJ/kg. 7. Assume that 30% of the fuel energy is lost as heat transfer in the engine 8. The engine indicated net fuel conversion efficiency is nr= 0.33 We shall look at the engine operating at 3000 rpm with A/F ratio = 22, and compressor pressure ratio (T.) of 1.5. i. What is the compressor outlet temperatures (T2) at compressor pressure ratios To= 1.5? ii. What is the engine intake air mass flow rate at this value of to?
c) To examine the behavior of turbocharging, we shall consider the following example of a four stroke 2.0 L displacement passenger car diesel engine turbocharged with a single stage centrifugal compressor, and a single stage turbine. For simplicity, there is no waste-gate and no inter-cooler. You may assume the following: 1. The ambient conditions are T1=300K and Pi=1 bar. The working fluid may be assumed to have constant properties of y = 1.35 and molecular weight of 29. 2. The turbine and compressor have constant efficiencies: ni= 0.85 and ne = 0.65. You may also assume that the Mach no. is small so that the kinetic energy of the fluid is negligible. 3. The compressor and turbine maps are shown in the accompanied figures. (For this simplified example, ignore the actual values of the ŋe contours on the compressor map and assume ne to be constant.) 4. The reference conditions of these maps are the same as the ambient conditions: Tref= T1; Pref= Pi. 5. The engine volumetric efficiency based on the intake manifold condition is constant: nv= 0.8. 6. The heating value of the diesel fuel is 43 MJ/kg. 7. Assume that 30% of the fuel energy is lost as heat transfer in the engine 8. The engine indicated net fuel conversion efficiency is nr= 0.33 We shall look at the engine operating at 3000 rpm with A/F ratio = 22, and compressor pressure ratio (T.) of 1.5. i. What is the compressor outlet temperatures (T2) at compressor pressure ratios To= 1.5? ii. What is the engine intake air mass flow rate at this value of to?
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Transcribed Image Text:c) To examine the behavior of turbocharging, we shall consider the following example of a four stroke 2.0 L displacement
passenger car diesel engine turbocharged with a single stage centrifugal compressor, and a single stage turbine. For
simplicity, there is no waste-gate and no inter-cooler. You may assume the following:
1. The ambient conditions are T1=300K and Pi=1 bar. The working fluid may be assumed to have constant properties
of y = 1.35 and molecular weight of 29.
2. The turbine and compressor have constant efficiencies: ni= 0.85 and Ne = 0.65. You may also assume that the
Mach no. is small so that the kinetic energy of the fluid is negligible.
3. The compressor and turbine maps are shown in the accompanied figures. (For this simplified example, ignore
the actual values of the ne contours on the compressor map and assume ne to be constant.)
4. The reference conditions of these maps are the same as the ambient conditions: Tref= T1; Pre= P1.
5. The engine volumetric efficiency based on the intake manifold condition is constant: ŋv= 0.8.
6. The heating value of the diesel fuel is 43 MJ/kg.
7. Assume that 30% of the fuel energy is lost as heat transfer in the engine
8. The engine indicated net fuel conversion efficiency is nr= 0.33
We shall look at the engine operating at 3000 rpm with A/F ratio = 22, and compressor pressure ratio (Te) of 1.5.
i.
What is the compressor outlet temperatures (T2) at compressor pressure ratios Te= 1.5?
ii.
What is the engine intake air mass flow rate at this value of nc?
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