On the 16th, the first composite wind tunnel in China dedicated to the aerodynamic research of low altitude aircraft was officially completed and put into use at Guangdong Aerospace Science and Technology Research Institute (hereinafter referred to as "Guangtian Institute"). This wind tunnel fills the infrastructure gap for low altitude aircraft from laboratory research to real-world scenario verification, marking a new breakthrough in the construction of the low altitude economic basic research platform in the Guangdong Hong Kong Macao Greater Bay Area. As a device for manually controlling airflow, wind tunnels are mainly used for systematic testing of aircraft. Compared with outdoor scene testing, wind tunnel testing has the advantages of shorter testing cycle and lower testing cost. Wind tunnel testing involves fixing the aircraft onto equipment, allowing air to flow and achieve relative motion, thereby accurately measuring various technical parameters of the aircraft during flight in the sky. ”Sun Liangbao, the technical director of Guangtian Institute's wind tunnel, introduced that the wind tunnel will undertake the core task of comprehensively verifying the wind resistance safety of aircraft. This wind tunnel combines traditional aviation wind tunnels with unmanned aerial vehicle wind wall testing systems, and is the first 4.5-meter wind tunnel in China to study and test the aerodynamic characteristics of low altitude aircraft. The opening of this wind tunnel will provide efficient and convenient "doorstep" testing services for low altitude aircraft research and development enterprises. From coordination to completion of experiments, it only takes 3-4 months, significantly reducing research and development costs and accelerating the transformation of technological breakthroughs into commercial applications. The all space unmanned system comprehensive test site, which was put into use on the same day, is divided into a physical test site and a digital test site. The physics test site consists of a 33 square kilometer airspace, a vertical takeoff and landing site, a taxiway, a 5G-A integrated sensing network, and a wind measurement radar; The digital experimental field includes a collaborative design platform, a supercomputing center, a digital twin center, and a full space unmanned system management service platform. It is reported that Guangtian Institute has received testing requirements from more than 10 units including Shenzhen Customs, Xiaopeng Huitian, and Weikai Testing. In the future, Guangtian Academy plans to build a "Bay Area No.1" aircraft wind tunnel test data sharing platform, and will work with low altitude aircraft research and development institutions, universities, and enterprises to continuously tackle key technologies for low altitude aircraft, and jointly build a standardized system for low altitude aircraft wind tunnel tests. (New Society)