A mathematical model for the study of gas-dynamic processes in the ejector for pulse detonation engine was developed. Mathematical simulation of the first two periods of the engine for three different ejectors for periods of 0.3 ms and 0.5 ms, 1 ms was carried out. The dependence of the flow of ejective air on time was obtain for each case. The dependence of thrust of the engine on time was obtain for each case. The efficiency of ejectors used in the work was analyzed. It was shown, that the more optimal shape of the ejector was the shape, in which the detonation wave weakens after leaving of the detonation camber.
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