3results about How to "Improve flow field quality" patented technology

This invention provides a circumferential airflow homogenizing device, an engine, and an aircraft. The device includes an annular cavity component, multiple air intake pipes, and multiple circumferential pipes. The annular cavity component is disposed outside and coaxially with the annular structure requiring air supply. The annular cavity has an outer annular surface and an inner annular surface. The multiple air intake pipes are symmetrically and evenly distributed on the outer annular surface of the annular cavity and communicate with the annular cavity. The multiple circumferential pipes are symmetrically and evenly distributed on the inner annular surface of the annular cavity and connected to the annular cavity at both ends. The air intake pipes and circumferential pipes are not coaxial. Airflow enters the annular cavity component through the air intake pipes, and after being homogenized in terms of flow rate and velocity within the annular cavity component, it flows to the annular structure through the circumferential pipes. The technical solution of this invention addresses the technical problem of the lack of a circumferential airflow homogenizing device for radially inlet annular structures in the prior art.

The application provides a high-altitude detection system of a wind speed and direction sensor, wherein the high-altitude detection system is installed on a transport operation platform, is lifted and stabilized on a wind speed and direction sensor operation plane through the platform, and is used for high-altitude real-time detection and / or calibration of the wind speed and direction sensor. The wind speed and direction sensor is usually installed at a high position, such as a wind speed and direction sensor on a catenary support post, which is installed at a position with a height of 4000 mm from a rail surface, and two wind speed and direction sensors are installed and fixed at each position; meanwhile, a railway line is relatively long, and even if real-time detection is carried out on site, it is very time-consuming and laborious. The application utilizes the extensibility of the operation platform at a high altitude and the convenience of long-distance transportation on the ground, meets the high-altitude detection needs of the wind speed and direction sensor, and unexpectedly solves the important practical problem of restricting the on-site detection of the wind speed and direction sensor.

The invention belongs to the technical field of subsonic velocity plane cascade wind tunnel tests, and particularly relates to an arc-shaped end wall coupling outlet tail plate structure and a design method thereof. According to the structure, an inlet flow channel is formed between a movable lower flow guide wall and a movable upper flow guide wall; a plurality of blades are arranged on the plane blade grid test piece at equal pitch; the arc-shaped upper end wall is mounted on the plane cascade test piece, and the front edge of the arc-shaped upper end wall is connected with the tail end of the movable upper flow guide wall; the arc-shaped lower end wall is installed on the plane cascade test piece, and the front edge of the arc-shaped lower end wall is connected with the tail end of the movable lower flow guide wall; the front edge of the upper tail plate is connected with the tail end of the arc-shaped upper end wall; the front edge of the lower tail plate is connected with the tail end of the arc-shaped lower end wall, and an outlet runner is formed between the lower tail plate and the upper tail plate. The method can improve the quality of a plane cascade wind tunnel flow field, and guarantees the effectiveness of test data.