The performance of combustion driver ignited by multi-spark plugsdistributed along axial direction has been analysed and tested. An improved ignitionmethod with three circumferential equidistributed ignitors at main diaphragm hasbeen presented, by which the produced incident shock waves have higher repeatability,and better steadiness in the pressure, temperature and velocity fields of flow behindthe incident shock, and thus meets the requirements of aerodynamic experiment.The attachment of a damping section at the end of the driver can eliminate the highreflection pressure produced by detonation wave, and the backward detonation drivercan be employed to generate high enthalpy and high density test flow. The incidentshock wave produced by this method is well repeated and with weak attenuation. Thereflection wave caused by the contracted section at the main diaphragm will weakenthe unfavorable effect of rarefaction wave behind the detonation wave, which indicatesthat the forward detonation driver can be applied in the practice. For incident shockwave of identical strength, the initial pressure of the forward detonation driver isabout 1 order of magnitude lower than that of backward detonation.
展开▼
