Computational Investigation of a Boundary-Layer-Ingestion Propulsion System
| Autor: | Karl A. Geiselhart, Brennan T. Blumenthal, Sven Schmitz, Alaa Elmiligui, Richard L. Campbell, Mark D. Maughmer |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Engine power
020301 aerospace & aeronautics Engineering business.industry Angle of attack Aerospace Engineering 02 engineering and technology Aerodynamics Computational fluid dynamics Propulsion 01 natural sciences 010305 fluids & plasmas 0203 mechanical engineering Fuselage Drag 0103 physical sciences Aerospace engineering business Propulsive efficiency |
| Zdroj: | Journal of Aircraft. 55:1141-1153 |
| ISSN: | 1533-3868 0021-8669 |
| Popis: | The present paper examines potential propulsive and aerodynamic benefits of integrating a Boundary-Layer Ingestion (BLI) propulsion system into the Common Research Model (CRM) geometry and the NASA Tetrahedral Unstructured Software System (TetrUSS). The Numerical Propulsion System Simulation (NPSS) environment is used to generate engine conditions for Computational Fluid Dynamics (CFD) analyses. Improvements to the BLI geometry are made using the Constrained Direct Iterative Surface Curvature (CDISC) design method. Potential benefits of the BLI system relating to cruise propulsive power are quantified using a power balance method, and a comparison to the baseline case is made. Iterations of the BLI geometric design are shown, and improvements between subsequent BLI designs are presented. Simulations are conducted for a cruise flight condition of Mach 0.85 at an altitude of 38,500 feet, with Reynolds number of 40 million based on mean aerodynamic chord and an angle of attack of 2° for all geometries. Results indicate an 8% reduction in engine power requirements at cruise for the BLI configuration compared to the baseline geometry. Small geometric alterations of the aft portion of the fuselage using CDISC has been shown to marginally increase the benefit from boundary-layer ingestion further, resulting in an 8.7% reduction in power requirements for cruise, as well as a drag reduction of approximately twelve counts over the baseline geometry. |
| Databáze: | OpenAIRE |
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