System and method for realizing spray shape detection and imaging in closed cavity

A technology of internal spraying and closed chamber, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of destroying the internal static characteristics of the engine, difficult to detect equipment, complex shape and structure, etc., to improve clarity and quality, prevent interference, Strong penetrating effect

Active Publication Date: 2018-11-06
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

At present, there is no method for non-destructive testing of the atomized form of fuel injection in the engine cylinder. Existing common testing methods include ray testing, ultrasonic

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  • System and method for realizing spray shape detection and imaging in closed cavity
  • System and method for realizing spray shape detection and imaging in closed cavity
  • System and method for realizing spray shape detection and imaging in closed cavity

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Embodiment Construction

[0029] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] The present invention adopts the following measures: the radionuclide in the positron liquid marks the fuel; adding a combustion residue remover removes the interference caused by the combustion residue rays; On this basis, the shape of the oil mist ejected from the fuel injector in the engine cylinder is detected and three-dimensionally imaged, and the spray space is extracted as a region of interest (VOI) by image segmentation for further processing, thus obtaining Spray shape and working conditions in the engine cylinder.

[0031] Such as figure 1 and figure 2 A system for detecting and imaging the spray shape in a closed cavity is shown, including an engine, a gamma photon detector 1, a gamma photon shielding ring 2, and an imaging device 3. There is a marked carrier solvent mixture in the engine oil cy...

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Abstract

The invention discloses a system and a method for realizing spray shape detection and imaging in a closed cavity. The system comprises an engine, gamma-photon detectors, gamma-photon shielding rings and imaging equipment, wherein an engine cylinder is internally provided with a labeled carrier solvent mixture; the carrier solvent mixture comprises a carrier solvent, a radionuclide and a combustionresidue remover; the gamma-photon detectors are arranged around the engine; the gamma-photon shielding rings are arranged around an engine injection nozzle and a fuel pipe; and the imaging equipmentis connected with the gamma-photon detectors. The method comprises the following steps: preparing the carrier solvent mixture as a fuel for operation of the engine; detecting shape of fuel mist in theengine by the gamma-photon detectors and performing static 2D imaging; and performing 3D imaging on spray shape, extracting interested regions and obtaining detection results. The system and the method provided by the invention can obtain the spray shape in the engine or detection results and 3D images of the spray shape in the closed cavity more accurately, clearly and intuitively.

Description

technical field [0001] The invention relates to non-destructive testing technology, in particular to a system and method for realizing spray shape detection and imaging in a closed cavity. Background technique [0002] In 1929, P.A.M. Dirac predicted the existence of positrons, and in 1932, C.D. Anderson discovered positrons when he used cloud chambers to study cosmic rays. Chinese physicist Zhao Zhongyao had previously observed (1929-1930) that heavy elements had anomalous absorption of hard gamma rays, accompanied by an energy release of about 5.50×10 5 Electron volts of photons, later confirmed as the generation of positron-electron pairs and the subsequent annihilation radiation of the positron. Positron annihilation refers to the process in which positrons and electrons disappear together after meeting and emit photons. Positrons are the antiparticles of electrons, having the same mass and charge as electrons, but the opposite sign of the charge. [0003] Positron an...

Claims

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Application Information

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IPC IPC(8): G01N23/225
CPCG01N23/225G01N2223/07G01N2223/108
Inventor 余唯一赵敏刘畅姚敏郭瑞鹏于雅涵陈少杰王世昌
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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