To investigate the variance law of cavity shape with cavitator drag coefficient for vehicles in unsteady conditions , the dynamic mesh technology in FLUENT 6.2 was implemented to simulate the unsteady cavitating flow of the traditional variable-drag cavitator. The drag coefficient and cavity shape of variable-drag cavitators with different central cone angles were compared, and the calculated results of the drag coefficient were consistent well with the experimental data. The response speed of the cavity profile under a traditional control scheme was researched as well, and the results show that the variance of cavity size represents hysteresis characteristics in the drag coefficient. Finally, a new control scheme of a variable lateral-force cavitator was proposed, and the simulation results show that a lift amounts to 30 percent of the drag which can be obtained when the upper part of the cavitator extrudes about by 10 percent of the diameter.%为研究非稳态条件下的航行体空泡形态随空化器阻力的变化规律,采用FLUENT6.2的动网格技术,对传统变阻力空化器的非定常空泡流进行了模拟,比较了不同中心锥角的变阻力空化器的阻力系数和空泡外形,其中阻力系数的计算结果与试验数据吻合较好；研究了传统控制方案下的空泡外形响应速度,结果显示空泡尺寸的变化要滞后于阻力系数；最后提出了一种新型的可变侧向力空化器的控制方案,模拟结果证明空化器上半周突出0.1DR时,可以获得相当于30％阻力的升力.
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