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Power Generation From Renewable Energy Sources 189

Diesel-PG (HCC) HOME+FO20-PG (RCC)
HOME+FO30-PG (RCC) HOME+FO10-PG (RCC)
HOME-PG (HCC)
80
Speed: 1500 RPM, CR: 17.5, Load: 80%,
70 Inj.timing: 27 bTDC, Biomass: Babul wood
Injector: For diesel 3 hole, 0.2 mm,
Cyliner pressure (bar) 50 Carburetor: Parallel flow gas entry
for HOME 4 hole, 0.3 mm
60
IOP:For diesel 205 bar,
for HOME 230 bar
40
30
20
10
0
280 330 380 430 480
Crank angle (degree CA)
Fig. 11.29 Variation of cylinder pressure with crank angle for different fuel combinations.

crank angle is shown in Fig. 11.29. Diesel-PG operation always resulted in
higher cylinder pressure when compared to all other fuel combinations.
Further cylinder pressure increased with HOME+FO-PG combination
when compared to HOME-PG combinations tested. Increased flame ve-
locity caused by fuel properties and improved mixing of air and fuel com-
bination associated with adequate swirl and squish generation resulted in
higher in-cylinder pressures. For HOME+FO20-producer gas operation
with RCC, in-cylinder flow turbulence improved the combustion due to
higher disorderness of air movement in engine cylinder resulting in im-
proved air-producer gas mixing along with injected fuel, leading to improved
brake thermal efficiency. This may lead to speeding up of preflame com-
bustion reactions. It is noticed that the use of fuel oil in HOME and RCC
plays a significant role during combustion. Addition of fuel oil fraction in
HOME has favorable effect on in-cylinder pressure caused by the increased
volatility of the HOME, leading to fuel blends to burn faster. However,
marginal increase in ignition delay for HOME+FO-producer gas combi-
nations may further lead to uniform mixture formation. However, addition
of higher energy content and higher volatile fuel oil in the high-viscous
HOME improves the fuel properties and makes the HOME-PG combina-
tion more compatible to diesel engine applications. But increased fraction
of fuel oil (more than 20% by vol) in HOME during dual fuel operation
leads to decreased spontaneous ignition, resulting in reduced cylinder pres-
sure with lowered reaction rates between fuel combinations. Therefore, as
and when fuel oil fraction is increased, cylinder pressure decreases slightly.