Nội dung được dịch bởi AI, chỉ mang tính chất tham khảo
Nghiên cứu các độ nhận dạng khí động học 2D của dầm hộp kín trong trường dòng hình sin
Tóm tắt
Nghiên cứu này khảo sát các độ nhận dạng khí động học của một dầm hộp kín trong cả trường dòng hình sin theo phương dọc (u-) và phương thẳng đứng (w-). Một loạt các dòng hình sin với tần số dao động rời rạc (fu = 00.2–1.2 Hz) và các biên độ dao động khác nhau (Δu = 0.5 – 2.0 m/s) được tạo ra thí nghiệm, hoàn toàn đồng pha theo hướng câu. Trong khi đó, phương pháp động lực học chất lỏng tính toán (CFD) được sử dụng để mô phỏng các dòng hình sin theo phương dọc với tần số cao hơn (fu = 0.2–14 Hz). Các hàm độ nhận dạng khí động học hai chiều liên quan đến độ hỗn loạn u (2D AAFs) của dầm hộp kín được xác định theo từng tần số. Ngược lại, các dòng hình sin theo phương thẳng đứng được mô phỏng số (fw = 0.2–14 Hz, Δw = 1.2 m/s), và các 2D AAFs liên quan đến độ hỗn loạn w được xác định. Cuối cùng, các sự khác biệt giữa các độ nhận dạng u-, w- và các độ tương đương được so sánh. Kết quả cho thấy các AAFs liên quan đến độ hỗn loạn u- và w- có các xu hướng khác nhau theo tần số giảm, do đó, việc coi các đóng góp của độ hỗn loạn u- và w- vào độ nhận dạng là tương đương trong các nghiên cứu trước đây là không chính xác.
Từ khóa
#khí động học #dầm hộp #dòng hình sin #độ nhận dạng khí động học #động lực học chất lỏngTài liệu tham khảo
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