Method for determining profile of conical nozzle of hypersonic-velocity low-density wind tunnel

• Main Authors: WANG TIEJIN, SUN YONGTANG, CUI CHUN, HUANG BINGXIU, SHI YUNJUN
• Format: Patent
• Language: English
• Published: 18.02.2015
• Subjects: MEASURING; PHYSICS; TESTING; TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR

The invention discloses a method for determining a profile of a conical nozzle of a hypersonic-velocity low-density wind tunnel. The method includes: dividing the profile of the conical nozzle of the hypersonic-velocity low-density wind tunnel into a contraction section profile and an expansion section profile, wherein the expansion section profile is provided with a throat-section circular curve and a conic curve; establishing a two-dimensional coordinate system; computing throat radius of the conical nozzle; according to the throat radius, determining the contraction section profile; connecting the throat-section circular curve with the conical curve to determine the expansion section profile, wherein the throat-section circular curve passes a half-height point of a throat and is tangent to the conical curve; connecting the contraction section profile with the expansion section profile to obtain the profile of the conical nozzle of the hypersonic-velocity low-density wind tunnel. The profile of the conical nozzle can be computed rapidly, the general technical requirement of the wind tunnel is met, and the shortcomings of an existing low-density profile nozzle design method, for example, existing conical nozzle profile design is complex and designed nozzles are large in Mach number deviation are overcome.