By Al Adcock
Built in its place for the Douglas A-4, the A-7 Corsair II has obvious strive against with either army and Air strength in Vietnam, Grenada and through Operation barren region hurricane. comprises the A-7A, A-7P, A-7B, A-7C, NA-7C, TA-7C, EA-7L, YA-7H, A-7D, A-7E, A-7G, A-7H, YA-7F, and A-7K editions. Over a hundred photographs, forty element drawings, 2 pages of scale drawings, thirteen full-color drawings. 50 pages.
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Extra resources for A-7 Corsair II in Action No 120
Yet in practice, one still finds frequent use of the classical gas dynamic relationships for the isentropic nozzle flow (see Table 1). The flow tube theory is simply modified, assigning the parameter ~ (an abbreviation for the ratio of the two specific heats cp and Cv of the gas mixture in local chemical equilibrium) a suitable averaged value. Possibly justified by practice, this use of an averaged value, however, corresponds theoretically to a polytropic process, and certainly not to isentropic changes.
In fact, quite the contrary has long been the case: in industrial practice, the code is utilized for the approximate calculation of thermodynamic properties of state of the burned gases along their flow path from their injection into the combustion chamber to the nozzle throat. Temperatures in the nozzle throat cross section determined with this method are then correlated with experimentally-obtained values of feed pressure, mass flow rate and thrust. 130). -58Except for the numerical data often practicable in individual cases, one of the motives for using such methodologically questionable 'matching procedures' (which frequently produce 'efficiencies' better than one), may be a physical phenomenon expressed in older rocket literature.
The characteristic material parameter 8 denotes the vibrational behaviour of the molecules. 273 -34A Through r , a relaxation parameter is introduced which is normally dependent on the thermal properties of state, and on the boundary conditions (such as for transfer processes or catalytic influences) or the history of the relaxation process as well. In the special case of the model gas (index A), a fair simplification A is made: r should be independent of the thermodynamic properties of A state.