Effects of Postinjection Application with Late Partially Premixed Combustion on Power Production and Diesel Exhaust Gas Conditioning

Abstract

The effects of postinjection with late partially premixed charge compression ignition (PCCI) were investigated with respect to diesel exhaust gas conditioning and potential power production. Initial tests comparing postinjection application with PCCI to that with conventional diesel high temperature combustion (HTC) indicated the existence of similar trends in terms of carbon monoxide (CO), total unburned hydrocarbon (THC), oxides of nitrogen (NOx), and smoke emissions. However, postinjection in PCCI cycles exhibited lower NOxand smoke but higher CO and THC emissions. With PCCI operation, the use of postinjection showed much weaker ability for raising the exhaust gas temperature compared to HTC. Additional PCCI investigations generally showed increasing CO and THC, relatively constant NOx, and decreasing smoke emissions, as the postinjection was shifted further from top dead center (TDC). Decreasing the overall air-to-fuel ratio resulted in increased hydrogen content levels but at the cost of increased smoke, THC and CO emissions. The power production capabilities of early postinjection, combined with PCCI, were investigated and the results showed potential for early postinjection power production.

Investigations of effects of pilot injection with change in level of compression ratio in a common rail diesel engine

“…The measurement was performed at an engine speed load point of 2600 rpm and 84 Nm loads. This reduction in ignition delay is major contributor for the NO x reduction as reported by many researchers [1,2,4]. Figure 3 shows the complete measurement layout used during the experiment.…”

“…In order to address the stringent emission norms worldwide, the solution for their control is classified into two broader ways [1]: (1) in cylinder combustion technologies, and (2) after-treatment technologies. Oxides of nitrogen (NO x ) and particulate matter (PM) is of prime concern in case of diesel engine and needs cost effective solution in order to be competitive in the market.…”

“…In HCCI, the early multiple injections help the mixture to burn lean in premixed part [1,2]. though very effective in reducing the pollutant but are expensive and takes out the competitive edge of diesel engines.…”

“…though very effective in reducing the pollutant but are expensive and takes out the competitive edge of diesel engines. However, the HCCI is restricted to typically low and medium load due to combustion instability at higher loads [1,2]. Therefore, it becomes very essential to explore the alternate combustion techniques such as homogeneous charged compression ignition (HCCI) and partially charged compression ignition (PCCI).…”

Experimental Investigation, ANN Modelling and TOPSIS Optimization of a Gasoline Premixed HCCI-DI Engine with Direct Injection of FeCl3 Nanodditive Blended WCO

“…This is due to the reduced flame temperature during the combustion of the lean homogeneous premixed charge. Since the formation of NO x is a function of temperature, even a small decrease in the temperature of the flames could reduce NO x emissions significantly [34]. Figure 5 (b) shows high NO x emissions for the DI and the HCCI-DI modes of operation with the FeCl 3 additive blended fuel when compared to the neat fuel.…”