Method and device for measuring cascade flow field through ultrasonic array installed in reflection mode
An ultrasonic array and cascade flow technology, which is applied in the direction of measuring devices, fluid velocity measurement, velocity/acceleration/shock measurement, etc., can solve problems such as wear, low cost, and large flow field influence
Pending Publication Date: 2022-07-29
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology
Contact measurements are mainly pressure probes and pneumatic probes, which are characterized by low cost and high signal-to-noise ratio, but they can only be measured at a single point and have a great impact on the flow field
Non-contact measurement is mainly particle image velocimetry PIV (Particle Image Velocimetry), but tracer particles need to be dispersed in the flow field during measurement, and the uniformity of tracer particles cannot be guaranteed under high-speed airflow and will collide with the flow channel wall. Collision occurs, causing wear and tear
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[0035] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the following embodiments describe a method and device for measuring cascade flow field with a reflectively installed ultrasonic array of the present invention with reference to the accompanying drawings.
[0036] In this embodiment, a method for measuring a cascade flow field with a reflectively installed ultrasonic array is provided.
[0037] figure 1 It is a flow chart of the method for measuring the cascade flow field by the ultrasonic array installed in the reflection type according to the embodiment of the present invention.
[0038] like figure 1 As shown, the method for measuring the cascade flow field of the reflectively installed ultrasonic array involved in this embodiment includes the following steps:
[0039] In step S1, a two-dimensional ultrasonic transducer array is arranged directly above the plane cascade channel. When the ga...
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The invention discloses a method for measuring a cascade flow field through a reflection-type installed ultrasonic array, and the method comprises the following steps: 1, arranging a two-dimensional ultrasonic transducer array right above a plane cascade channel, transmitting and receiving ultrasonic waves through an ultrasonic measurement system when gas flows through the cascade channel, and measuring the flow field of a cascade flow field through the two-dimensional ultrasonic transducer array; obtaining the transit time signal waveforms of the ultrasonic waves in the forward and reverse flow states; and 2, processing the transition time signal waveform by adopting a signal processing method to obtain the transition time of the ultrasonic wave reaching the receiving transducer, and reconstructing a two-dimensional velocity field through the transition time. Wherein M * N ultrasonic transducers are vertically arranged right above channels of two adjacent blades in the plane blade grid channel, and matching layers of the ultrasonic transducers need to be flush with the upper surfaces of the blades. The invention further discloses a device for measuring the cascade flow field through the ultrasonic array installed in a reflection mode. The measuring method and device are simple in structure and principle, non-contact online measurement can be achieved, and interference to a flow field is avoided.
Description
technical field [0001] The invention relates to the technical field of flow field measurement, in particular to a method and a device for measuring the flow field of a blade cascade by a reflectively installed ultrasonic array. Background technique [0002] There are many and complex factors affecting the cascade flow field, including geometric factors: consistency, geometric installation angle, etc., and aerodynamic factors: incoming Mach number, shock boundary layer interference, etc. The air flow in the compressor is a diffuse flow, so flow separation is easy to occur, which triggers the stall flutter of the blades or causes the compressor to surge, resulting in serious accidents. In a gas turbine, phenomena such as supercharging acceleration and eddy current will occur between the multi-stage cascades, which will affect the combustion efficiency in the combustion chamber of the gas turbine, thereby affecting the performance of the entire gas turbine. The key to solving ...
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IPC IPC(8): G01P5/24
CPCG01P5/241
Inventor 俞天阳苏明旭田昌侯怀书张世玮马良却依飞
Owner UNIV OF SHANGHAI FOR SCI & TECH