Film-effectiveness measuring apparatus and measuring method using blow-down wind tunnel

• Main Authors: JEONG JIN YOUNG, KWAK JAE SU
• Format: Patent
• Language: English; Korean
• Published: 06.03.2020
• Subjects: BLASTING; ENGINE PLANTS IN GENERAL; HEATING; LIGHTING; MACHINES OR ENGINES IN GENERAL; MEASURING; MECHANICAL ENGINEERING; NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES; PHYSICS; STEAM ENGINES; TESTING; TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR; WEAPONS

The present invention relates to an apparatus and a method of measuring a film cooling efficiency using a blow-down wind tunnel, which set the opening rate of an air flow rate control valve (220) to be a pre-set opening rate, which is greater than a target opening rate falling under a pre-set target air flow rate, open an on/off valve (210), and make air introduced into a test rig (300) from an air tank (100) through a duct (230). After that, the apparatus and the method control the opening rate of the air flow rate control valve (220) to be the target opening rate, and control a film cooling fluid flow rate control valve (610) before the air flow flowing to the test rig (300) becomes a normal status after the on/off valve (210) is opened, thereby making the film cooling fluid flow to the test rig (300) at the pre-set target film cooling fluid flow rate. When the air flow flowing to the test rig (300) becomes a normal status, the apparatus and the method control a camera (370) to photograph a surface of a blade to be measured (330). 공기유량 제어밸브(220)의 개도율을 미리 설정된 목표 공기유량에 해당하는 목표 개도율보다 큰 설정 개도율로 설정한 후, 온/오프 밸브(210)를 개방시켜 덕트(230)를 통해서 공기탱크(100)로부터 테스트 리그(300)로 공기가 유입되도록 하며, 이후 공기유량 제어밸브(220)의 개도율을 목표 개도율로 조절하면서, 온/오프 밸브(210)가 개방되고 나서 테스트 리그(300)로 흐르는 공기의 흐름이 정상상태가 되기 전에 막냉각 유체유량 제어밸브(610)를 제어하여 막냉각 유체가 미리 설정된 목표 막냉각 유체유량으로 테스트 리그(300)로 흐르게 하고, 테스트 리그(300)로 흐르는 공기의 흐름이 정상상태가 되면 카메라(370)를 제어하여 측정대상 블레이드(330)의 표면을 촬영하도록 한다