Inverse Design of Cabin Air-supply Direction and Temperature by Proper Orthogonal Decomposition

摘要

Air supply is crucial for creating proper air distribution inside aircraft cabins. Currently, an aircraft designer has to apply a guess-and-correction procedure to determine the air-supply parameters. The design process is quite lengthy but not necessary to guarantee optimal results. This investigation proposes to adopt proper orthogonal decomposition (POD) to inversely de-sign multiple air-supply parameters based on the specified design targets. The method first sampled some thermo-flow data by full CFD simulations, and then the orthogonal spatial modes and their coefficients are extracted. To construct more field data, a two-dimensional cubic spline interpolation was applied to obtain the coefficients of other air-supply parameters that are not included in the original data samples. The above method was applied to design the air-supply direction and temperature in a three-dimensional cabin. The PMV index that is specially proposed for aircraft cabins was adopted as design targets. The results show that the proposed method is able to efficiently determine the air-supply temperature and directions simultaneously. Most computing burden lies in solving original data samples by CFD, while the POD analysis and data construction is quite efficient.