• Transactions of the Korean Society of Mechanical Engineers B
• /
• v.35 no.12
• /
• pp.1375-1381
• /
• 2011

Combustion processes in an optically-accessible single-cylinder heavy-duty diesel engine equipped with a highpressure common-rail injection system were investigated for JP-8 and diesel. Direct imaging and two-color thermometry were employed to verify the emission trend for both fuels. The combustion process was characterized by image analysis with focus on luminosity. The results of two-color thermometry were analyzed on the basis of the flame temperature and KL factor distribution. Analysis of the combustion process by direct imaging showed that the ignition delay was longer for JP-8 than for diesel, while the flame was extinguished rapidly. Analysis of the flame luminosity showed that the combustion intensity was higher for diesel and that the flame lasted for a longer duration in this case. Two-color thermometry results showed that the high-temperature region extended over a large area during JP-8 combustion, implying the formation of a large amount of $NO_x$. In addition, the KL factor showed low level over a large area and relatively homogeneous in the case of JP-8 combustion, which implied that less smoke was produced when using this fuel.

• Journal of the Korean Society of Visualization
• /
• v.3 no.2
• /
• pp.21-40
• /
• 2005

• Journal of the Korean Society of Propulsion Engineers
• /
• v.20 no.4
• /
• pp.1-8
• /
• 2016

An experimental study was performed for the combustion-field visualization of the burner which burns the liquid hydrocarbon fuel atomized by an ultrasonic oscillator. Configurations of the flame and combustion-field were caught by both high-speed camera and thermo-graphic camera, and those images were analyzed in detail through a post-processing. As a result, the combustion-field grew and reaction-temperature rose due to the strengthening of combustion reaction with the increasing flow-rate of carrier-gas. In addition, a phenomenon of flame flickering was discussed through the comparative analysis of the variational behaviors between the visible flame and IR (Infrared) flame-field.

• Journal of the Korean Society of Combustion
• /
• v.4 no.1
• /
• pp.39-47
• /
• 1999

A combustion flame visualization system, which is used as an engine diagnostics tool, was developed in order to understand the combustion reaction mechanism in the development stage for S.I. engines. The measurement system consists of an I-CCD camera and a computer-aided image processing system. By using optically accessible engine system, the flame structure was analyzed from the acquired graylevel image and the direction of flame propagation (shape of flame) has been measured to understand combustion phenomena. And combustion radical which involves combustion information were measured. As a result, strong relation between combustion radicals intensity ratio and air excess ratio was found.

• Proceedings of the Korean Society of Propulsion Engineers Conference
• /
• 2009.11a
• /
• pp.213-216
• /
• 2009

In order to see the flame behavior in the gas turbine combustor, combustion test was performed by using sector combustor. Ignition test with torch ignition system was carried out at the various combustor inlet velocity and air fuel ratio. Also, flame blow out limit was measured by changing fuel flow rate with fixed air mass flow rate. In the test results, stable ignition is possible at air excess ratio of 6 and this limit is gradually increased with combustor inlet air velocity. The minimum blow out limit is about 4 at 40 m/s of combustor inlet velocity. This blow out limit is also increased up to about 10 with increasing combustor inlet velocity.

• 한국연소학회:학술대회논문집
• /
• 2014.11a
• /
• pp.399-400
• /
• 2014

• 한국연소학회:학술대회논문집
• /
• 2014.11a
• /
• pp.405-406
• /
• 2014

• 한국연소학회:학술대회논문집
• /
• 2015.12a
• /
• pp.335-337
• /
• 2015

• 한국연소학회:학술대회논문집
• /
• 2015.12a
• /
• pp.339-339
• /
• 2015

• Journal of the KSME
• /
• v.33 no.12
• /
• pp.1052-1062
• /
• 1993

지금까지 엔진내의 연소현상에 관한 많은 문헌들이 보고되고 있으나, 주로 계측기술에 관한 전 반적인 소개 내용이 많으며, 실제 엔진에 대한 적용 현황과 적용시 발생하는 문제점 및 해결책 등에 대한 보고는 많지않은 실정이다. 이 글에서는 필자가 경험한 계측과 가시화 기술을 중심으 로 엔진내의 연소현상 해석에 적용되는 최근의 광응용 계측기술 및 개발 동향을 소개하고자 한다.