Chinese Academy of Sciences

Other

Chaoqun Nie

Hongwu Zhang

Juan Du

Fan Li

Sichen Wang

Zhiting Tong

Jichao Li

An apparatus for diagnosing and controlling the aerodynamic stability of a compressor and method there of are provided. The apparatus includes a measurement device (), a signal processing device () and a control and execution device (), wherein the measurement device () is configured to measure the pressure or velocity fluctuations of air flows in different positions inside a compressor in real time, and to transmit real-time measurement signals obtained from different positions to the signal processing device (); the signal processing device () is configured to determine, according to the real-time measurement signals, a type and spatial distribution of instability precursor in the compressor, and to output corresponding control strategy signals to the control and execution device (); and the control and execution device () executes, according to the received control strategy signals, corresponding control actions to regulate the stability of the compressor (S).

Apparatus and method for diagnosing and controlling aerodynamic stability of compressor

A dynamic five-hole probe includes a pressure sensing part, a pressure measuring hole transition section, a pressure acquisition section, dynamic pressure sensors and flexible wall pressure buffering tubes, the pressure sensing part being provided with pressure measuring holes to sense three dimensional dynamic pressure components of an airflow; the pressure measuring hole transition section transits from an inlet end surface five-hole structure into an outlet end surface five-hole structure; the pressure acquisition section has therein a centrally symmetric pressure measuring hole structure; pressure sensor mounting holes are in communication with the five pressure measuring holes; each of the dynamic pressure sensors is mounted in a corresponding one of the sensor mounting holes to measure a dynamic pressure of the airflow. The pressure sensing part may have a diameter of 3 mm or less.

Dynamic five-hole probe

A haptic signalizing device comprises a number of piezoelectric elements arranged below a device surface such that mechanical deformations caused by the converse piezoelectric effect in the at least one piezoelectric element make the device surface to move such that the device surface follows the piezoelectric element and a driving circuit configured to cause the converse piezoelectric effect on the at least one piezoelectric element by generating an alternating electric field over the piezoelectric element in a bipolar fashion, that is, consecutively in both the same and the opposite direction with respect to the polarization of the piezoelectric element, to make the piezoelectric element to move beyond its initial position consecutively in both directions. The piezoelectric element is arranged i) to locally move the device surface inwards when the mechanical deformation in the piezoelectric element is a deflection directed away from the device surface, and ii) to locally move the device surface outwards when the mechanical deformation in the piezoelectric element is a deflection that is directed towards the device surface.

High frequency response pressure sensor based on direct current glow discharge plasma principle

Growing community of inventors

Beijing, China

Chaoqun Nie