Author:
Ha Hiep Nguyen,Cong Doan Nguyen,Quoc Quan Nguyen,Van Duong Nguyen
Abstract
<div class="section abstract"><div class="htmlview paragraph">The most preferred method for reducing mechanical losses in internal combustion
engines (ICEs) is profiling contact surfaces, which involves forming
microreliefs on the inner surface of cylinder liners (CLs). This work presents
analytical and experimental results of the frictional power losses in the
four-stroke diesel engine with smooth and microrelief CLs. The regular
microreliefs (RMR), with a groove width of 0.4 mm, an amplitude of 1.5 mm, and a
relative frictional area of 8.6%, were formed through vibration rolling.
Experiments were conducted on both smooth and microrelief cylinders by measuring
fuel consumption at 25–100% nominal load and idle mode at a constant speed. The
results showed that compared to the engine with smooth CLs, the total frictional
power is reduced by an average of 10.8%, mechanical efficiency is increased by
4.0%, and fuel consumption is decreased by 6.4% for the engine with microrelief
cylinders. The measured frictional power dropped by 0.90 kW, which is close to
the 0.81 kW value calculated using mathematical models and Ansys software
simulation.</div></div>