Joulean Heating and Lorentz Force Effects on Gaseous Detonation Flow Fields
MASSACHUSETTS INST OF TECH CAMBRIDGE
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The flow field of gaseous detonation waves is studied to determine how heat addition and momentum changes brought about by the application of electromagnetic fields will affect such properties as pressure temperature and particle velocity. An analysis based on a one-dimensional nonsteady model for the flow field, coupled to a one-dimensional quasisteady model for the wave front is presented. Results of numerical solutions, using electric field values and current distributions obtained from experimental measurements, for cases with electric fields only and for electric fields plus both positive and negative Lorentz forces are presented. Solutions simulating energy losses by assuming that the E - j enthalpy addition is just balanced by heat loss are also presented. Quartz crystal pressure transducers were used in experiments to test theoretical predictions of pressure changes, and the wave speed was monitored to determine how it compared to theory. Pressure changes of as much as 20 were observed under the combined influence of Lorentz forces and electrical heating. These compared favorably with analytical solutions which allowed some heat loss to the wall. No change in wave speed was detected, which was also in agreement with theoretical predictions for these experiments.
- Electricity and Magnetism
- Fluid Mechanics