Ion Based Pressure Sensor for Pulse Detonation Engines
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A high speed durable ion probe based pressure sensor is being investigated for use in pulse detonation engines. The environment encountered in such engines necessitates high temperature and durable (vibration resistant) devices. Traditional pressure sensors can be used however, various methods and materials used to protect the sensors dampen and reduce the pressure wave allowing for qualitative results only. An alternative transient pressure sensing method is investigated for pressures behind a hydrocarbon flame in the pulse detonation engine. Hydrocarbon flames generate ions that are quenched...
A high speed durable ion probe based pressure sensor is being investigated for use in pulse detonation engines. The environment encountered in such engines necessitates high temperature and durable (vibration resistant) devices. Traditional pressure sensors can be used however, various methods and materials used to protect the sensors dampen and reduce the pressure wave allowing for qualitative results only. An alternative transient pressure sensing method is investigated for pressures behind a hydrocarbon flame in the pulse detonation engine. Hydrocarbon flames generate ions that are quenched by collisions with other species and walls. As the collision rate is a function of pressure, so too is the ion decay rate. The ion decay rate is measured using an ion probe that is well suited for high temperature flow, has no moving parts, and is inexpensive. Similar systems have been used to determine multiple combustion conditions in automobile engines.
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