Flow characteristics and entrance length effect for MEMS nozzles

Li, Chunhui; Mickan, Bodo

doi:10.1016/j.flowmeasinst.2013.07.005

Cited by 9 publications

(2 citation statements)

References 3 publications

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“…Yan et al [ 3 ] proposed a method based on the X-ray phase to measure the nozzle geometry and used the three-dimension reconstruction technique to construct the internal structure of nozzles. Li et al [ 4 ] studied the critical back pressure ratio and the discharge coefficients and used the method to measure the traditional ISO nozzles with circular throat sections and sonic MEMS nozzles with rectangular throat sections. Fei et al [ 5 ] employed conoscopic holography to measure the inner cone angle of aero-engine nozzles in a noncontact way and used a five-axis coordinate measuring machine to measure the high-precision conic angle.…”

Section: Introductionmentioning

confidence: 99%

3D Measurement Method for Saturated Highlight Characteristics on Surface of Fuel Nozzle

Hou

Chen

2022

Sensors

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Saturated highlights on metal surfaces reduce the detection accuracy of fuel nozzles. In this paper, we propose an image inpainting method with a saturated highlight based on the statistics of similar patches used in prior segmentation of the subregion. The sequence image acquisition is based on the shape from focus in the five-axis platform. By our method, the focus measure (FM) operator and the window size are evaluated using the sharpness evaluation curve and calculating time. We observe that the detection accuracy is improved when the highlight area is filled by the highlight-free area within the same segmentation region. There are fewer deviation points in the three-dimensional (3D) point cloud that are extracted from the sequence images. The inlet circle and the outlet circle of the fuel nozzle are both detected by the two-dimensional (2D) Hough Transform (HT) method. Our experiments show that the method yields better results in 3D detection of the key parameters of fuel nozzles with the saturated highlight characteristics.

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Section: Introductionmentioning

confidence: 99%

3D Measurement Method for Saturated Highlight Characteristics on Surface of Fuel Nozzle

Hou

Chen

2022

Sensors

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“…The thermal effect is significant at low Reynolds number [4]. For the last decade, thermal effect of sonic nozzle had been investigated by Bignell and Choi [5], Li and Mickan [6], Hu et al [7], Wright et al [3], and Unsal et al [4]. ------------- Considering thermal effect, mass flow rate eq.…”

Section: Introductionmentioning

confidence: 99%