Study of laminar flame speed measurement under high pressure condition using double kernel method by laser-induced breakdown ignition

Abstract

In order to understand turbulent combustion and its combustion characteristics, laminar flame speed is often used. Laminar flame speed plays an important role in turbulent combustion models used in engine combustion simulation. However, there are few reports on laminar flame speed of liquid fuel under high pressure condition simulating the inside of an engine cylinder. In this study, the measuring system using simple compact equipment was developed to obtain laminar flame speed of liquid fuel with the double kernel method under high pressure conditions. In this equipment, as easily ignited at high pressure, laser induced breakdown ignition technique was used. The experiments were conducted on propane-air premixed gas so that it could be easily compared with the reports of other researchers. The experiment was conducted on propane/air premixture so that it could be easily compared with the other reports. A detailed investigation of the time history of the flame separation revealed that the conventional method of calculating the laminar flame speed used in the double kernel method was not suitable for this measuring system. Therefore, a new calculation method for the laminar flame speed was studied, and the pressure dependence of the laminar flame speed of the propane/air premixture was investigated. As a result, it was found that it was in good agreement with other reports. The laminar flame speed measurement system developed in this study is considered to be useful. upper part of the chamber and a cartridge heater (CT16-125, Nippon Heater) is attached to the lower part of the chamber to control the initial temperature. A fixed amount of propane and air is supplied to the chamber by using a partial pressure method to form a premixed gas with the equivalence of 1.