Abstract
This paper presents the results from 1.6 litre, 4 cylinders stratified charge compressed natural gas (CNG) direct injection engine with boosting device. A turbocharger with compressor trim of 40 was used to increase engine output. The engine was tested at wide open throttle (WOT) and speed ranging from 1000 to 5000 rpm. Engine performance and emissions data were recorded under steady state condition. Results show turbocharged CNG engine produced an average of 26% increment in brake power and 24% additional maximum brake torque as compared with natural aspirated (NA) CNG engine. Turbocharged CNG engine improved brake specific fuel consumption (BSFC) and yielded higher fuel conversion efficiency (FCE). Relatively turbocharged CNG engine showed lower emission of hydrocarbon (HC) and carbon monoxide (CO) throughout tested engine speed. Conversely, the carbon dioxide (CO 2 ) and nitrogen oxide (NO x ) emission produced were slightly higher compared with NA CNG engine.
Highlights
The exhaust gases of vehicles are one of the main contributors to the world’s greenhouse gases problem.Quest for alternative fuel for automotive engine has gained more attentions mainly due to stringent emission limit and instability of world liquid fossil fuel price
The performance of compressed natural gas (CNG) engine with respect to brake power, brake torque, brake mean effective pressure, brake specific fuel consumption (BSFC), fuel conversion efficiency (FCE) and exhaust emissions were examined for natural aspirated (NA) and force induction under several steady state conditions
The maximum brake power obtained by NA and turbocharged were 50 kW and 59 kW respectively both at pm
Summary
The exhaust gases of vehicles are one of the main contributors to the world’s greenhouse gases problem.Quest for alternative fuel for automotive engine has gained more attentions mainly due to stringent emission limit and instability of world liquid fossil fuel price. The use of natural gas as an alternative fuel in spark ignition (SI) direct injection (DI) engine have been studied expansively and utilized in vehicles [1,2]. Higher octane number of natural gas gives several advantages as a fuel for SI engine including suitable for high compression ratio engine operation, higher thermal efficiency and less knocking problem. The use of turbocharging technology in gasoline SI engine is limited due to knocking and premature combustion [4]. Interest in application of boosting device operating on natural gas engine produced promising results. This is due to higher knocking resistance properties of natural gas and suitable for high compression ratio SI engine [5]
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