The Propulsive Duct

Abstract

A Theoretical Approach to Assessing the Thermodynamic Process Within the Combustion Chamber of the Propulsive Duct, an Examination of the Potential of the Duct with Special Reference to the Application of Feedback and Spark Discharge Techniques. The type of valve of greatest importance to successful duct design is one which is synchronized to the pressure fluctuations within the combustion zone. Although there have been a number of proposals for mechanically linked valves (indeed the normal internal combustion engine works on this principle) and rotary valves, these have severe limitations at the higher frequencies and are generally impracticable for the application under review. This section will therefore concentrate on the mechanical reed‐type valve which, theoretically, need have only one moving part, i.e. the dynamic metal reed, and the aerodynamic valve which relies upon the interaction of two gas dynamical vibrations and has no moving mechanical parts.

Citation

Tharratt, C.E. (1965), "The Propulsive Duct", Aircraft Engineering and Aerospace Technology, Vol. 37 No. 12, pp. 359-371. https://doi.org/10.1108/eb034103