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Title: Devices to improve the performance of a conventional two-stroke spark ignition engine

Abstract

This paper presents research efforts made in three different phases with the objective of improving the fuel economy of and reducing exhaust emissions from conventional, carbureted, two-stroke spark ignition (SI) engines, which are widely employed in two-wheel transportation in India. A review concerning the existing two-stroke engine technology for this application is included. In the first phase, a new scavenging system was developed and tested to reduce the loss of fresh charge through the exhaust port. In die second phase, the following measures were carried out to improve the combustion process: (1) using an in-cylinder catalyst, such as copper, chromium, and nickel, in the form of coating; (2) providing moderate thermal insulation in the combustion chamber, either by depositing thin ceramic material or by metal inserts; (3) developing a high-energy ignition system; and (4) employing high-octane fuel, such as methanol, ethanol, eucalyptus oil, and orange oil, as a blending agent with gasoline. Based on the effectiveness of the above measures, an optimized design was developed in the final phase to achieve improved performance. Test results indicate that with an optimized two-stroke SI engine, the maximum percentage improvement in brake thermal efficiency is about 31%, together with a reduction of 3400more » ppm in hydrocarbons (HC) and 3% by volume of carbon monoxide (CO) emissions over the normal engine (at 3 kW, 3000 rpm). Higher cylinder peak pressures (3-5 bar), lower ignition delay (2-4{degrees}CA){degrees} and shorter combustion duration (4-10 {degrees}CA) are obtained. The knock-limited power output is also enhanced by 12.7% at a high compression ratio (CR) of 9:1. The proposed modifications in the optimized design are simple, low-cost and easy to adopt for both production and existing engines.« less

Authors:
 [1]; ;  [2]
  1. Argonne National Lab., IL (United States)
  2. Indian Inst. of Tech., Madras (India)
Publication Date:
Research Org.:
Argonne National Lab., IL (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
81855
Report Number(s):
ANL/ES/CP-85485; CONF-9504174-1
ON: DE95013492
DOE Contract Number:  
W-31-109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: American Society of Mechanical Engineers (ASME) 1995 Spring technical conference, Marietta, OH (United States), 23-26 Apr 1995; Other Information: PBD: [1995]
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; 40 CHEMISTRY; SPARK IGNITION ENGINES; TESTING; CARBURETORS; COMBUSTION KINETICS; SCAVENGING; CATALYSTS; CATALYTIC COMBUSTORS; CERAMICS; COATINGS; AUTOMOTIVE FUELS; IGNITION SYSTEMS; FUEL ADDITIVES; DESIGN; FUEL CONSUMPTION; EMISSION

Citation Formats

Poola, R.B., Nagalingam, B., and Gopalakrishnan, K.V. Devices to improve the performance of a conventional two-stroke spark ignition engine. United States: N. p., 1995. Web.
Poola, R.B., Nagalingam, B., & Gopalakrishnan, K.V. Devices to improve the performance of a conventional two-stroke spark ignition engine. United States.
Poola, R.B., Nagalingam, B., and Gopalakrishnan, K.V. Thu . "Devices to improve the performance of a conventional two-stroke spark ignition engine". United States. https://www.osti.gov/servlets/purl/81855.
@article{osti_81855,
title = {Devices to improve the performance of a conventional two-stroke spark ignition engine},
author = {Poola, R.B. and Nagalingam, B. and Gopalakrishnan, K.V.},
abstractNote = {This paper presents research efforts made in three different phases with the objective of improving the fuel economy of and reducing exhaust emissions from conventional, carbureted, two-stroke spark ignition (SI) engines, which are widely employed in two-wheel transportation in India. A review concerning the existing two-stroke engine technology for this application is included. In the first phase, a new scavenging system was developed and tested to reduce the loss of fresh charge through the exhaust port. In die second phase, the following measures were carried out to improve the combustion process: (1) using an in-cylinder catalyst, such as copper, chromium, and nickel, in the form of coating; (2) providing moderate thermal insulation in the combustion chamber, either by depositing thin ceramic material or by metal inserts; (3) developing a high-energy ignition system; and (4) employing high-octane fuel, such as methanol, ethanol, eucalyptus oil, and orange oil, as a blending agent with gasoline. Based on the effectiveness of the above measures, an optimized design was developed in the final phase to achieve improved performance. Test results indicate that with an optimized two-stroke SI engine, the maximum percentage improvement in brake thermal efficiency is about 31%, together with a reduction of 3400 ppm in hydrocarbons (HC) and 3% by volume of carbon monoxide (CO) emissions over the normal engine (at 3 kW, 3000 rpm). Higher cylinder peak pressures (3-5 bar), lower ignition delay (2-4{degrees}CA){degrees} and shorter combustion duration (4-10 {degrees}CA) are obtained. The knock-limited power output is also enhanced by 12.7% at a high compression ratio (CR) of 9:1. The proposed modifications in the optimized design are simple, low-cost and easy to adopt for both production and existing engines.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1995},
month = {6}
}

Conference:
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