Answer to Question #269474 in Mechanical Engineering for Rohit

Question

An air standard ideal Diesel engine (k for air = 1.4) operates with a pressure and temperature at the start of the compression stroke of 14.7 psia and 550°R. If the cut-off ratio and clearance volume are 2.5 and 1.0 ft3, respectively, calculate

(a) Pressure, temperature and specific volume at the 4 states of the cycle

(b) Clearance

(c) Thermal efficiency

(d) MEP for the cycle.

Answer 1

Diagram with the table is given below:

An ideal Diesel engine operates on 1.5 lb of air with a suction state at 14.1 psia and 100 F. The pressure at the end of compression is 475 psia and the cut -off is 6% of the stroke from head -end dead - center. Using air properties (R=53.34 ft-lbf/Ibm-R, k=1.4, Cp =.24, Cv=. 1714 Btu/lbm-R),