Abstract
Abstract : Solutions for isothermal, isentropic, and constant Mach number (at a specified location) flows with constant acceleration are obtained. It is shown that in application to high-speed guns, these solutions necessitate variable gun geometry or heating of the propellant; both requirements are considered at present impractical. Numerical solutions which give constant projectile acceleration in a fixed geometry gun are computed for ideal and real hydrogen propellant. Using the latter, and the appropriate similarity parameters, as well as practical constraints related to gun and projectile geometry and strength, it is shown that a substantial increase in muzzle velocity could be obtained if the constant base pressure cycle were more closely approximated in actual launchings. At present the velocity attained with large caliber guns is much smaller than with the small ones. In this connection, the validity of linear scaling of guns and the resulting possibility of application of small- scale developments to large caliber guns are indicated.
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