Abstract
We examine the problem of ideal gas discharge from a cylindrical tube closed at one end into a vacuum, with unsteady mass and energy addition. The gas mass is formed by vaporization of the tube wall material due to the thermal flux from the heated gas. Under the assumption of uniform energy addition throughout the volume varying in accordance with the damped oscillation law, we obtain approximate relations for the mass of the discharging gas and the impulse of the pressure forces on the end wall as a function of time and energy. The resulting impulse values are compared with those determined for unsteady expansion into a vacuum of an ideal gas of given mass when energy is added to it. An increase of the impulse calculated by this technique in comparison with the value calculated using the proposed technique is shown.
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