Download Aerodynamic Heating and Thermal Protection Systems by L. S. Fletcher PDF

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  • April 20, 2017
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By L. S. Fletcher

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045 805. 980. 215. 54 323. 14 O AS INDICATED 100 10000 1000 P 100000 CAV C D vTi^D, N/m(J/kg),1/2 Fig. 4 Rub seal heating rate correlation based on cavity pressure and total enthalpy. 01 105 100 P/hj D, N/m (J/kg)1' Fig. 5 Rub seal heating rate correlation based on freestream static pressure and total enthalpy. , pvTvf D. This correlation is given in Fig. 5. It is seen that the fit is good for the intermediate gap widths, where Cp is approximately constant and where the pressure drop in the cove (discussed in the Appendix) is small.

One is the determination of a correlation parameter for the internal heating rate to the rub tube, and the other is the prediction of the overall energy flow into the elevon cove junction and the mean temperature rise of the entire wing/el evon junction structure. Correlation Parameter The heat transfer to the internal components of the cove seal is related directly to the rate at which energy flows through the cove due to a pressure difference. Except possibly for the zero gap case, free convection may be neglected.

It was considered desirable to correlate only in terms of known external flow properties and the gap widths. At first, correlation should be made in terms of known quantities to justify Eq. (6) experimentally; however, h0 and h c^v are not measurable directly. These quantities were obtained for two gap widths by solving Eqs. (7-9), using the cove wall heat-flux distributions q(s)/qs inferred by Duffy6 and shown in Fig. 3. Using the results given in Table 2 for which dT/dt is available, it was found that dT/dt <* (mh0) * .

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