Effect of Port Premixed LPG on the Engine Characteristics

[+] Author and Article Information
V. Edwin Geo

Department of automobile engineering SRM University KATTANKULATHUR, TAMIL NADU 603203 India vedwingeo@gmail.com

Ankit Sonthalia

SRM IST, NCR Campus Ghaziabad, Uttar Pradesh 201204 India ankit_sont@yahoo.co.in

Govindan Nagarajan

Sardar Patel Road Chennai, Tamilnadu 600025 India nagarajan1963@yahoo.com

B. Nagalingam

SRM IST, Kattankulathur Chennai, Tamil nadu 603203 India bnagsiit@yahoo.com

Fethi Aloui

LAMIH, UMR CNRS 8201 Campus Le Mont Houy Valenciennes, 59313 France fethi.aloui@univ-valenciennes.fr

1Corresponding author.

Contributed by the Internal Combustion Engine Division of ASME for publication in the Journal of Energy Resources Technology. Manuscript received October 9, 2018; final manuscript received May 1, 2019; published online xx xx, xxxx. Assoc. Editor: Samer F. Ahmed.

ASME doi:10.1115/1.4043698 History: Received October 09, 2018; Accepted May 02, 2019


In the present work, Liquefied petroleum gas (LPG) is premixed with air for combustion in a compression ignition engine, along with neat rubber seed oil as the direct injected fuel. The LPG is injected directly into the intake manifold using an electronic gas injector. The variation in LPG flow rate is from zero to the maximum tolerable value. The engine load was varied from no load to full load in regular intervals of 25% of full load. Experimental results indicate reduction in thermal efficiency at low loads, followed by a small improvement in the thermal efficiency at 75% and 100% loads. Premixing of LPG prolongs the delay in ignition with simultaneous decrease in the duration of combustion. With increase in LPG flow rate the maximum in-cylinder pressure increased at high outputs; whereas it decreased at low outputs. The heat release rate shows that the combustion rate increases with LPG induction. CO and HC levels reduced at high outputs, whereas at all loads the NOx levels increased. The NOx level at full load increased from 6.9 g/kWhr at no LPG induction to 10.36g/kWhr at 47.63% LPG induction. At all loads the smoke level decreased drastically. The smoke level at full load decreased from 6.1 BSU at no LPG induction to 3.9 BSU at 47.63% LPG induction.

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