Sự không ổn định của dòng chảy cưỡng bức trong một bể hình trụ xoay với một đĩa quay khác biệt trên bề mặt tự do

Science in China Series E: Technological Sciences - Tập 53 - Trang 2477-2488 - 2010
ChunMei Wu1, YouRong Li1
1College of Power Engineering, Chongqing University, Chongqing, China

Tóm tắt

Sự không ổn định của dòng chảy cưỡng bức trong một bể hình trụ xoay với một đĩa quay khác biệt trên bề mặt tự do được điều tra thông qua một loạt các mô phỏng số ba chiều không ổn định. Kết quả cho thấy trạng thái dòng chảy cơ bản của hệ thống này có tính đối xứng trục và ổn định, nhưng có nhiều cấu trúc phong phú tại mặt phẳng kinh tuyến. Tuy nhiên, khi số Reynolds của xoay vượt qua một giá trị giới hạn, dòng chảy sẽ trải qua một giai đoạn chuyển tiếp sang dòng chảy dao động ba chiều, được đặc trưng bởi các sóng dao động vận tốc di chuyển theo hướng phương vị. Các đặc điểm chính của các mẫu dòng chảy được trình bày, bao gồm hướng lan truyền, vận tốc, biên độ và số sóng, phụ thuộc vào tốc độ và hướng quay của đĩa và bể hình trụ, đồng thời các điều kiện giới hạn cho sự khởi đầu của dòng chảy dao động cũng được xác định. Đối với trường hợp chỉ có đĩa quay, sự không ổn định ly tâm là nguyên nhân chịu trách nhiệm cho sự chuyển tiếp dòng chảy, và khi đĩa quay cùng chiều hoặc ngược chiều với bể hình trụ, các cơ chế cho sự chuyển tiếp lần lượt là sự không ổn định hình ellip và không ổn định cắt tròn.

Từ khóa

#dòng chảy cưỡng bức #bể hình trụ #mô phỏng số #sự không ổn định #số Reynolds #dao động ba chiều

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