Effect of Producer Gas from Redgram Stalk and Combustion Chamber Types on the Emission and Performance Characteristics of Diesel Engine

Abstract

The engine performance has been improved by modifying the combustion chamber shape of the diesel engine for dual-fuel operation with liquid fuel and producer gas (PG). The combined effect of gaseous fuel from redgram stalk and combustion chamber type on the emission and performance of blended-fuel of diesel and HOME biodiesel–PG has been investigated. In this experimental study, four varieties of combustion chambers hemispherical (HCC), low swirl (LSCC), dual swirl (DSCC), and toroidal re-entrant (TRCC) were analyzed comprehensively. The results presented that the TRCC configuration with a given nozzle geometry has 9% improved brake thermal efficiency (BTE) and 10.4% lower exhaust gas temperature (EGT). The smoke, unburnt hydrocarbon (UBHC), and carbon monoxide (CO) decreased by 10–40%, but a 9% increase in nitrogen oxides (NOX) emission levels was observed with TRCC. The delay period and combustion period were decreased by 5% and 7%. The fuel replacement of about 71% for the diesel–PG combination with HCC and 68% for the HOME–PG combination with TRCC was achieved.

Analysis of the Exothermic Reaction of Flame Ignition in the Combustion Chamber of a Gas Turbine Unit

“…The final decision on the choice of the preferred organization of the combustion chamber operating mode of a gas turbine unit is made on the basis of a technical and economic analysis, taking into account also the type of fuel-burning system of the turbine unit. Therefore, the design of combustion chamber diffusers must take into account the criterion condition (21) and the dependence shown in Figure 4.…”

“…where u, υ, w-gas flow velocity vector projections spread out along Cartesian axes of coordinates; dG-mass gas flow through the elementary site dF, normal to the gas flow velocity vector; W p -mass speed of chemical reaction [21][22][23]:…”

“…From the analysis of the graph in Figure 4, it follows that when the value of parameter A is less than 0.374, i.e., when the gas flow in the diffuser is stable (see criterion condition (21) obtained above), the variation of the circumferential non-uniformity coefficient of the gas temperature field at the combustion chamber outlet from instance to instance is minimal and is caused only by the variation of the geometric dimensions of the flowing part of the combustion chamber within the tolerance field during its manufacture.…”

“…Therefore, the design of combustion chamber diffusers must take into account the criterion condition (21) and the dependence shown in Figure 4.…”

The Performance of an Air-Cooled Diesel Engine with a Variable Cross-Section Dual-Channel Swirl Chamber

“…This kind of engine is widely applied in all kinds of small agricultural machinery, engineering machinery and ships [1,2]. However, there are still some defects in the swirl chamber diesel engine compared with a DI, such as a higher thermal load, lower charring efficiency and about 5% lower average effective pressure [3][4][5]. The increasingly urgent requirements for low emissions in recent years also prompted the improvement of the working performance of the diesel engine with a swirl chamber.…”