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The DC Arc in a Supersonic Nozzle Flow

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3 Author(s)
Chan, S.K. ; Department of Mechanical Engineering University of Hong Kong Pokfulam Road, Hong Kong ; Fang, M.T.C. ; Cowley, M.D.

The boundary layer integral method at its second level of approximation has been used to study the DC arc in a supersonic nozzle flow. It is shown that with the inclusion of the arc momentum balance, the critical point of the flow is, generally, not the sonic point of the external flow. The speed, at which a disturbance propagates relative to the external flow, is in general supersonic and is dependent on the arc conditions. The arc model is capable of predicting the axial electric field, the arc size and the axial pressure distribution as a function of current. For affinely related nozzles, the solution is determined by a parameter N, which is related to zt, the stagnation condition and the nominal current density at the throat (I/At). Numerical results are given for a particular nozzle shape although the method of analysis is general. Practical implications as regards nozzle design for a gas blast circuit breaker are briefly discussed.

Published in:

Plasma Science, IEEE Transactions on  (Volume:6 ,  Issue: 4 )

Date of Publication:

Dec. 1978

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