1. Engineering
  2. Mechanical Engineering
  3. messages l 1104 am k back intro to automotive hw1docx...

Question: messages l 1104 am k back intro to automotive hw1docx...

Question details

Messages l 11:04 AM K Back Intro to Automotive HW1.docx 1 Introduction to Automotive Engineering Homework 1- Due Friday, Feb. 1 1. (30 pts) Otto Cycle Analysis A single cylinder S.I. engine is operating at its idle speed, 650 revolutions per minute (RPM). Assume at the start of the induction stroke that the operating fluid is air at standard conditions (T- 308 Kelvin, P-100 kPa, gamma-1.4, c 1.005 kJ/(kg*K), Cv=0.718 kJ/(kg*K)). Assume further that the specific heats are constant (i.e., not a function of temperature). The exhaust gas temperature at the start of the exhaust stroke is measured to be 800 K. The volume of air ingested is 6.0E-4 and a 9.5 compression ratio can be assumed. 0.287 kJ/(kg K) For all questions, you can use a value of R equal to a. Find the temperature, pressure, and volume of the operating fluid at each point on the Otto Cycle (i.e., points, 2, 3, and 4). Hint: you can use the Ideal Gas Law to relate any two points on the cycle, and you can do this a total of three times (if you were to do it the fourth time, the information would be redundant since the cycle is closed). b. After completing a., find the mass of fluid in the cylinder (use the Ideal Gas Law) c. A fter completing b., find the heat added to the system d. After completing b., find the heat subtracted from the system e. After completing d., find the work done in one cycle f. Finally, find the power (kW) generated by this S.I. engine at idle. Hint: use the operating RPM, be careful with units and note that I kW IkJ/s, and recall that the piston travels up and down twice during one thermodynamic cycle. 2. (10 pts) Starting with the expressions stated in class for the entropy change from 2->3 and 4-> 1, together with the temperature relationships TyT, and 7/T, found during the isentropic processes 1->2 and 3->4, prove that the change in entropy for the complete cycle is zero. 3. (10 pts) Write a 5-7-5 Haiku describing an automotive
Solution by an expert tutor
Blurred Solution
This question has been solved
Subscribe to see this solution