43rd Fluid Dynamics Conference / Aerospace Numerical Simulation Symposium 2011 (July 7-8, 2011. Waseda University, International Conference Center), Tokyo Japan
抄録（英）
Detonation initiation is one of the important problems of pulse detonation engines. A reflector installed near a predetonator exit is effective to maintain detonation waves. The incident detonation wave from the predetonator transforms its shape from planer to cylindrical and cylindrical to toroidal around the reflector. To prevent the detonation wave downstream of reflector from disappearing, it is important to form a cylindncal detonation wave upstream of the reflector. In this paper, the authors used a large-bore plate combustor and varied the following parameters to find the necessary condition to form a cylindrical detonation wave: the quantity of the driver gas and time from the ball valve opening to the ignition. To evaluate the quantity of the driver gas, an overfilling distance is used. The overfilling distance is the radius of the 10 mm high cylinder whose volume is equivalent to the total amount of the driver gas used in the experiment. Results indicate that the mixing between the driver and target gases affects the ability of successful transition. When a cylindrical detonation wave is formed, an annular soot track structure appears in the vicinity of the predetonator exit. This structure and velocity of detonation waves show that the transformation of the incident detonation wave into the cylindrical detonation wave resuls from the twice reflection from the plates of the combustor. To form a cylindrical detonation Wave, the driver gas should fill the volume much larger than the annular structure area.
内容記述
形態: カラー図版あり
内容記述（英）
Physical characteristics: Original contains color illustrations
大口径平板燃焼器を伝播する円筒デトネーション波に関する研究
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