oalogo2  

AUTHOR(S):

Ramesh Kumar, TN Verma

 

TITLE

Performance characteristics of a spark ignited variable compression ratio engine at erratic loads

pdf PDF

ABSTRACT

Never ending demand for efficient and less polluting engines have always inspired newer technologies. Extensive study has been done on variable compression ratio, a promising in-cylinder technology, in the recent past. The present work is an experimental investigation to examine the variation of different parameters such as brake thermal efficiency, exhaust gas temperature and emissions with respect to change in compression ratio in a single-cylinder carbureted SI engine at different loads with two different fuels. Experiments were conducted at three different compression ratios (CR = 7.6:1, 7.8:1 and 8:1). The fuels used in this study are pure gasoline. The results showed that brake thermal efficiency increases with CR at all loads. Further, the experimental results showed the scope of improving the part-load efficiency of SI engine by adopting the concept of variable compression ratio (VCR) technology, especially when fuels with better antiknock characteristics are used. The uncertainty analysis of the experiments based on the specifications of the equipment used is also tabulated.

KEYWORDS

Performance characteristics; spark ignition; VCR

REFERENCES

[1] Thomas R., Sreesankaran M., Jaidi J., Paul D. M., Manjunath P., 2016. Experimental evaluation of the effect of compression ratio on performance and emission of SI engine fueled with gasoline and n-butanol blend at different loads. Perspectives in Science; 8: 743—746

[2] Alahmer A., Aladayleh W., 2015. Effect two grades of octane numbers on the performance, exhaust and acoustic emissions of spark ignition engine. Fuel; 180 : 80–89

[3] Çinar C., Sahin F., ÖzerC.,Uyumaz A., 2016. A comparison of performance and exhaust emissions with different valve lift profiles between gasoline and LPG fuels in a SI engine. Applied Thermal Engineering; 107: 1261–1268

[4] Nithyanandan K., Zhang J., Li Y., Wu H., Lee T., Lin Y., Lee C.F., 2016. Improved SI engine efficiency using Acetone–Butanol–Ethanol (ABE)Fuel; 174 : 333–343

[5] Altın I., Bilgin A., Ceper A., 2016. Parametric study on some combustion characteristics in a natural gas fueled dual plug SI engine. Energy; 1-6

[6] Wu H., Yu X., Du Y., Ji X., Niu R., Sun Y., Gu J., 2015. Study on cold start characteristics of dual fuel SI engine with hydrogen directinjection. Applied Thermal Engineering; 100 : 829–839

[7] Lal S., MohapatraS.K., 2016. The effect of compression ratio on the performance and emission characteristics of a dual fuel diesel engine using biomass derived producer gas. Applied Thermal Engineering; 119 : 63–72

[8] Rajak U, Nashine P, Singh TS, Verma TN. Numerical investigation of performance, combustion and emission characteristics of various biofuels. Energy Convers Manag. 2018;156. doi:10.1016/j.enconman.2017.11.017.

[9] Holman JP. Experimental methods for engineers. McGraw-Hill Publishers; 2012. ISBN 978-0-07-352930-1.

Cite this paper

Ramesh Kumar, TN Verma. (2018) Performance characteristics of a spark ignited variable compression ratio engine at erratic loads. International Journal of Applied Physics, 3, 9-13

 

cc.png
Copyright © 2018 Author(s) retain the copyright of this article.
This article is published under the terms of the Creative Commons Attribution License 4.0