首页|Laser ignition and flame propagation of methanol-air mixture in a constant volume combustion chamber
Laser ignition and flame propagation of methanol-air mixture in a constant volume combustion chamber
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
NETL
NSTL
Taylor & Francis
The combustion performance of laser-ignited methanol-air mixture ina constant volume combustion chamber was investigated using theSchlieren photography technique. The experimentation was conducted at5, 7, 9, and 11 MPa fuel injection pressure and 363 K initial chamber temperatureusing a neodymium-doped yttrium aluminum garnet (Nd:YAG) laserof 1064 nm wavelength. The gasoline direct injection (GDI) system was usedfor injecting the fuel at different pressures inside the chamber. The laserbeam is focused into the chamber using a 150 mm focal length lens, andlaser energy of 200 mJ was used for all experimentation. The Schlierensystem was used for capturing flame propagation of methanol-air mixturefor different equivalence ratios. The pressure-time history for equivalenceratio (ϕ) of 0.8, 0.9, and 1.0 was plotted and analyzed at different chamberfilling pressures. Flame propagation was found faster for ϕ of 1.0 due tohigher laminar velocity than 0.8 and 0.9. Flame visualization showed that theflame attains the ellipsoid shape during the early stage of ignition. It generatestwo lobes in the vertical direction and then again expands ina horizontal direction toward the ignition source. For all equivalence ratios,the flame propagation toward the incoming laser source (X-) was observedfaster compared to the flame propagation in the direction and perpendicularto the laser beam direction. For all equivalence ratios, higher laminar flamespeed was observed at 5 MPa injection pressure; however, it decreases as theinjection pressure increases. At ϕ of 1.0 and 11 MPa injection pressure, themaximum peak pressure of 0.67 MPa and combustion duration of 19.3 mswere noted. At 9 MPa injection pressure and ϕ of 1.0, the peak pressure andcombustion duration was found as 0.61 MPa and 19.4 ms, respectively. At ϕof 0.8, the peak pressure and combustion duration were observed 0.27 MPawith 34.6 ms duration and 0.47 MPa with 36.9 ms duration at 5 MPa and 11MPa injection pressures, respectively.
Combustion durationflame propagationlaser-ignitionmethanolpressure-time history
Department of Mechanical Engineering, College of Engineering Pune (COEP), Savitribai Phule Pune University, Pune,India
Department of Mechanical Engineering, College of Engineering Pune (COEP), Savitribai Phule Pune University, Pune,India,Mechanical Engineering Department, Dr. Vishwanath Karad MIT World Peace University, Pune, India
NETL
NSTL
Taylor & Francis
