The control loop of scramjet combustor was designed to control the thrust force increment and combustor-isolator interaction(CII) by feedback of force and isolator pressure measurements

where the fuel mass flow was regulated by fuel mass flow control system based on controllable cavitating Venturi.On the direct-connect test system

two experiments were conducted to implement single level thrust force control and multi-level thrust force/CIIcontrol

respectively.The test results show that: the fuel mass flow control system works reliably with fuel regulated accurately by directed movement of Venturi;the thrust force varies with fuel mass flow almost synchronously;and the thrust force increment and CIIare controlled efficiently.This work lays a foundation for further study of scramjet combustor control.