A 3-liter 6-cylinders square engine (bore = stroke) with two intake valves and one exhaust valve per cylinder is designed to have an output power of 300 kW and a corresponding bmep of 18.5 bar. The intake temperature is 55°C. Assume an average flow coefficient at the intake valve of 0.35. a) Calculate the intake valve area and the diameter of intake valves for a good volumetric efficiency (Mach index Z of 0.6) b) Calculate the exhaust valve area if the exhaust gases temperature is 600°C; the average flow coefficient at the exhaust valve is 0.6. c) The exhaust valve opens when the piston is at the bottom dead center. For a lift 1 = 1.35 cm of the exhaust valve, calculate the flow rate through the exhaust valve. The average flow coefficient at the exhaust valve is 0.6 and the cylinder pressure and temperature are 500 kPa and 600°C. Assume exhaust system pressure is 105 kPa. Notes: The specific heat ratio and gas constant for the gases at the inlet and exhaust valves are respectively ↑ =1.4 and R = 287 J/kg.K

A 3-liter 6-cylinders square engine (bore = stroke) with two intake valves and one exhaust valve per cylinder is designed to have an output power of 300 kW and a corresponding bmep of 18.5 bar. The intake temperature is 55°C. Assume an average flow coefficient at the intake valve of 0.35. a) Calculate the intake valve area and the diameter of intake valves for a good volumetric efficiency (Mach index Z of 0.6) b) Calculate the exhaust valve area if the exhaust gases temperature is 600°C; the average flow coefficient at the exhaust valve is 0.6. c) The exhaust valve opens when the piston is at the bottom dead center. For a lift 1 = 1.35 cm of the exhaust valve, calculate the flow rate through the exhaust valve. The average flow coefficient at the exhaust valve is 0.6 and the cylinder pressure and temperature are 500 kPa and 600°C. Assume exhaust system pressure is 105 kPa. Notes: The specific heat ratio and gas constant for the gases at the inlet and exhaust valves are respectively ↑ =1.4 and R = 287 J/kg.K

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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b) A single-acting, two-stage reciprocating air compressor runs at a speed of 500 rev/min with overall pressure ratio of 20 to 1 has free air delivery of 5.0 m3/min. For the first stage compressor, the pressure and temperature at the end of induction stroke is 100kPa and 27°C, respectively. The intermediate pressure is 500 kPa, and the intercooling process is complete. The clearance volumes of both stages are 5% of their respective swept volumes. The ambient pressure and temperature are at 100 kPa and 27°C, respectively. The index of compression and expansion, n is 1.3. i) Sketch the cycle on a P-V diagram. ii) Determine final delivery temperature of the compressor, C. iii) Determine totalindicated power, kw. iv) Determine volumetric efficiency for the first stage, %. v) Calculate the swept volume of the first and second stage, m2. Take the value of R for air is 0.287 kl/kg.K.
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