18 A single-cylinder, two-stroke cycle model airplane engine with a 7.54-cm displace ment produces 142 kW of brake power at 23,000 RPM using glow plug ignition. The square en- gine (bore stroke) uses 31.7 gm/min of castor oil-methanol-nitrome thane fuel at an air-fuel ratio AF = 4.5. During intake scavenging. 65% of the incoming air-fuel mixture gets trapped in the cylinder, while 35% of it is lost with the exhaust be fore the exhaust port closes. Combustion efficiency n = 0.94. Calculate: (a) Brake specific fuel consumption. [gm/kW-hr] (b) Average piston speed. [m/sec] (c) Unburned fuel exhausted to atmosphere. [gm/min] (d) Torque. [N-m]
18 A single-cylinder, two-stroke cycle model airplane engine with a 7.54-cm displace ment produces 142 kW of brake power at 23,000 RPM using glow plug ignition. The square en- gine (bore stroke) uses 31.7 gm/min of castor oil-methanol-nitrome thane fuel at an air-fuel ratio AF = 4.5. During intake scavenging. 65% of the incoming air-fuel mixture gets trapped in the cylinder, while 35% of it is lost with the exhaust be fore the exhaust port closes. Combustion efficiency n = 0.94. Calculate: (a) Brake specific fuel consumption. [gm/kW-hr] (b) Average piston speed. [m/sec] (c) Unburned fuel exhausted to atmosphere. [gm/min] (d) Torque. [N-m]
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter10: Heat Exchangers
Section: Chapter Questions
Problem 10.19P
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