PHÂN TÍCH DÒNG CHẢY TRÊN BỀ MẶT BẰNG XỬ LÝ ẢNH VÀ ỨNG DỤNG TRONG XÁC ĐỊNH TRƯỜNG MA SÁT TRÊN BỀ MẶT CÁNH TAM GIÁC

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Tác giả: Đình Anh Lê, Thế Hùng Trần

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học và Công nghệ - Đại học Thái Nguyên, 2022

Mô tả vật lý: tr.127 - 136

Bộ sưu tập: Metadata

ID: 332651

Thêm vào giỏ Liên kết toàn văn

Hiển thị dòng chảy quanh vật thể bay có vai trò quan trọng, giúp đánh giá hiệu quả của thiết kế. Trong các nghiên cứu trước đây, phương pháp truyền thống chủ yếu được sử dụng trong mô phỏng dòng chảy. Trong cách tiếp cận này, dầu được trộn lẫn với chất tạo màu, như ô xit ti tai, được phủ trên bề mặt. Các hiện tượng dòng chảy trên bề mặt vật được thảo luận dựa vào ảnh chụp sau quá trình thí nghiệm, và không có thuật toán xử lý nào được áp dụng. Nghiên cứu trình bày thuật toán xử lý dữ liệu trong hiển thị dòng chảy trên bề mặt. Bố trí thí nghiệm, đánh giá và thuật toán xử lý dữ liệu được trình bày. Thuật toán được ứng dụng nhằm phân tích dòng chảy trên cánh có độ giãn dài nhỏ và cánh dạng tam giác. Các kết quả tính toán cho thấy phương pháp cho hiệu quả tốt trong hiển thị đặc trưng dòng chảy trên bề mặt mô hình. Vị trí tách, hợp dòng, tách dòng thứ cấp cũng được mô tả cụ thể. Các kết quả của nghiên cứu cung cấp dữ liệu tham khảo quan trọng cho nghiên cứu mô phỏng số sau này.Surface flow visualization around flying objects plays an important role in evaluating the efficiency of the design process. In previous studies, traditional oil flow visualization technique was mainly used for visualizing flow. In this approach, oil is mixed with pigments, such as titanium dioxide is pained on the surface. The flow phenomenons on the surface are discussed based on the image taken after the wind tunnel test and no data processing technique is applied. This study presents a data processing algorithm for visualizing flow on the surface. Experimental setup, evaluation, and the algorithm are presented. The algorithm is applied for analyzing surface flow on a low-aspect-ratio wing and a delta wing. The processing results indicate that the method shows high efficiency in extracting flow on the surface of models. The locations of separation, reattachment, and secondary separation are presented. The difference in flow between the two models is also shown in detail. The results of the present study provide a good reference for further numerical simulation.

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