Homogeneous Charge with Direct Multi-pulse Injection A Promising High Efficiency and Clean Combustion Strategy for Diesel Engines IIT Madras

Format:

Book

Conference/Event

Author/Creator:

chaurasiya, rishabh, author.

Contributor:

Krishnasamy, Anand

Conference Name:

SAE Powertrains, Fuels & Lubricants Digital Summit (2021-09-28 : Live Online, Pennsylvania, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2021

Summary:

Reactivity Controlled Compression Ignition (RCCI) is a most promising low temperature combustion strategy for diesel engines that offers high thermal efficiency along with low oxides of nitrogen (NOx) and soot emissions. Nevertheless, the complexity of engine system hardware due to dual fuel injection systems and the associated controls, high unburned hydrocarbon (HC) and carbon monoxide (CO) emissions are the major shortcomings in RCCI. Recently, Homogeneous Charge with Direct Injection (HCDI) strategy is proposed to address the above limitations of RCCI. Unlike RCCI, HCDI is a single fuel LTC strategy with port and direct injection of diesel fuel and thus, there is no reactivity stratification. However, the equivalence ratio and thermal stratification with direct injected (DI) diesel fuel result in better combustion control, lower HC and CO emissions in HCDI compared to RCCI. In the present work, HCDI strategy is investigated under multiple injections of direct injected (DI) fuel to examine further benefits. A production light duty diesel engine used for agricultural water pumping applications is modified to run in HCDI mode through suitable changes in the intake manifold and the fuel injection systems. Experiments are conducted at the rated engine speed under varying load conditions in conventional diesel combustion (CDC), HCDI with single and double pulse DI modes. As compared to CDC, single pulse HCDI results in increase in indicated thermal efficiency up to 10%, decrease in CO emissions by 96.8%, however, HC and NOx emissions increase by 12% and 42.7%, respectively. With double pulse HCDI, indicated thermal efficiency increases by 21.5%, CO, HC and smoke emissions decrease by 93%, 35%, and 12.5%, respectively, however, there is a NOx emission penalty by a factor of 2 in comparison to single pulse HCDI. The scientific reasons behind the benefits obtained in HCDI are discussed in detail in the manuscript

Notes:

Vendor supplied data

Publisher Number:

2021-01-1156

Access Restriction:

Restricted for use by site license