h i g h l i g h t sThe adaptive cycle engine is an evolutional concept of variable cycle engine. The advantages of the adaptive cycle engine depend on the matching principles. The equilibrium running principles of the adaptive cycle engine are deduced. A nonlinear component-based adaptive cycle engine performance model is built. The application of the equilibrium running principles based on model is proposed.
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b s t r a c tAs an evolutional concept of variable cycle engine, the adaptive cycle engine draws widely attention with high expectations. It combines a variable geometry schedule and component matching principles to demonstrate its advantages such as avoiding severe inlet spillage drag and the wide variable cycle characteristics. Thus, this paper aims at equilibrium running principle analysis on an adaptive cycle engine at variable operating modes, deriving the equilibrium running equations of an adaptive cycle engine for the first time, and exploring the physical essence of components matching principle on the basis of a newly developed nonlinear component-based adaptive cycle engine performance model. It uncovers the physical essence of components matching relationships and provides mathematical derivation of equilibrium running principles which lay theoretical foundation of the variable geometries modulation schedule and overall performance optimization on an adaptive cycle engine.
As an evolutional concept of aero engine, the variable cycle engine (VCE) can adjust the thermodynamic cycle via working on different modes to meet different flight missions. These working modes lead to the performance and stability of variable geometries for mode switching under different mission profiles. This paper aims at the performance prediction analysis on the key variable geometry, namely the forward variable area bypass injector (FVABI). The rotary and translating mathematical calculation models are established and validated via the numerical simulation. It considers the choked flow state caused by area change at FVABI and mode selector valve (MSV). The variable geometry schedules at the typical subsonic cruise working condition are analyzed on the basis of the 0-D engine performance model. It verifies the efficiency of the improved zero-dimensional bypass mixing calculation model to predict the mixing characteristics of the FVABI on different operating modes. The maximum error of the total pressure recovery coefficient and the ejection ratio is 2.3% and 6.2%. This performance prediction method can lay foundations for the variable geometry design and performance optimization of the VCE under typical mission profiles.
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