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DTIC ADA456411: MHD Flow Control and Power Generation in Low-Temper... |
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by Defense Technical Information Center |
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Report developed under STTR contract for topic AFO5-T016. |
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Results of cold MHD flow deceleration and MHD power- |
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generation experiments conducted at The Ohio State |
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University are presented. MHD effect on the flow is |
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detected from flow static-pressure measurements. The |
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observed static-pressure change is due to the MHD |
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interaction and not Joule heating of the flow in the |
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crossed discharge. Comparison of experimental results |
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with modeling calculations shows that the retarding |
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Lorentz force increases the static-pressure rise produced |
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by Joule heating of the flow, while the accelerating |
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Lorentz force reduces the pressure rise. The experiments |
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show that at the present conditions, the electric current |
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in the MHD power-generation regime is very low, on the |
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order of 1 mA. This is entirely due to the bottleneck |
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effect of the discharge cathode layer at conditions where |
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the MHD open voltage is significantly lower than the |
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cathode-voltage fall. Modeling calculations demonstrate |
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that (1) at the flow conductivities currently achieved in |
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low-temperature MHD flows (sigma approx. 0.1 mho/m), low |
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open voltages reduce the MHD currents by more than two |
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orders of magnitude, and (2) this effect cannot be |
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circumvented by seeding the flow at feasible levels |
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(approx. 0.1% or using electrodes with a high secondary- |
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emission coefficient. |
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Date Published: 2018-06-07 01:03:17 |
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Identifier: DTIC_ADA456411 |
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Item Size: 66148052 |
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Language: english |
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Media Type: texts |
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# Topics |
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DTIC Archive; Gogineni, Sivaram P ; I... |
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