Dr. Yunqiang Sun Profile

Dr. Yunqiang Sun

at China Aerodynamics Research and Development Ctr

SPIE Involvement:

Author

Publications (6)

Proceedings Article | 24 November 2021 Paper

Numerical analysis for the influent of reaction to ejector

Yunqiang Sun, Zebin Ren, Zhilong Huang, Haifeng Wang, Jinlei Lv, Jiming Chen

Proceedings Volume 12060, 120600R (2021) https://doi.org/10.1117/12.2605809

KEYWORDS: Numerical simulations, Aerodynamics, Particle beams, High power lasers, Diffusers, Chemical oxygen iodine lasers

Read Abstract +

Proceedings Article | 24 November 2021 Paper

Numerical analysis of optical mirror jet-flow purging characteristics

Yunqiang Sun, Zebin Ren, Dachuan Xu, Jinlei Lv, Zhilong Huang, Qin Liu

Proceedings Volume 12060, 120600S (2021) https://doi.org/10.1117/12.2606028

KEYWORDS: Mirrors, Particles, Solids, Optical components, Numerical simulations, Fluid dynamics

Read Abstract +

Proceedings Article | 25 October 2016 Paper

Theoretical analysis for scaling law of thermal blooming based on optical phase deference

Yunqiang Sun, Zhilong Huang, Zebin Ren, Zhiqiang Chen, Longde Guo, Fengjie Xi

Proceedings Volume 10156, 1015615 (2016) https://doi.org/10.1117/12.2246693

KEYWORDS: Thermal blooming, Thermography

Read Abstract +

In order to explore the laser propagation influence of thermal blooming effect of pipe flow and to analysis the influencing factors, scaling law theoretical analysis of the thermal blooming effects in pipe flow are carry out in detail based on the optical path difference caused by thermal blooming effects in pipe flow. Firstly, by solving the energy coupling equation of laser beam propagation, the temperature of the flow is obtained, and then the optical path difference caused by the thermal blooming is deduced. Through the analysis of the influence of pipe size, flow field and laser parameters on the optical path difference, energy scaling parameters Ne=nTαLPR2/(ρεCpπR02) and geometric scaling parameters Nc=νR2/(εL) of thermal blooming for the pipe flow are derived. Secondly, for the direct solution method, the energy coupled equations have analytic solutions only for the straight tube with Gauss beam. Considering the limitation of directly solving the coupled equations, the dimensionless analysis method is adopted, the analysis is also based on the change of optical path difference, same scaling parameters for the pipe flow thermal blooming are derived, which makes energy scaling parameters Ne and geometric scaling parameters Nc have good universality. The research results indicate that when the laser power and the laser beam diameter are changed, thermal blooming effects of the pipeline axial flow caused by optical path difference will not change, as long as you keep energy scaling parameters constant. When diameter or length of the pipe changes, just keep the geometric scaling parameters constant, the pipeline axial flow gas thermal blooming effects caused by optical path difference distribution will not change. That is to say, when the pipe size and laser parameters change, if keeping two scaling parameters with constant, the pipeline axial flow thermal blooming effects caused by the optical path difference will not change. Therefore, the energy scaling parameters and the geometric scaling parameters can really describe the gas thermal blooming effect in the axial pipe flow. These conclusions can give a good reference for the construction of the thermal blooming test system of laser system. Contrasted with the thermal blooming scaling parameters of the Bradley-Hermann distortion number ND and Fresnel number NF, which were derived based on the change of far field beam intensity distortion, the scaling parameters of pipe flow thermal blooming deduced from the optical path deference variation are very suitable for the optical system with short laser propagation distance, large Fresnel number and obviously changed optical path deference.

Proceedings Article | 19 October 2016 Paper

Chemical laser exhaust pipe design research

Yunqiang Sun, Zhilong Huang, Zhiqiang Chen, Zebin Ren, Longde Guo

Proceedings Volume 10152, 101520R (2016) https://doi.org/10.1117/12.2246691

KEYWORDS: Thermal blooming, Thermography

Read Abstract +

Proceedings Article | 17 September 2013 Paper

Simulation for thermal blooming of the axial pipe flow

Yunqiang Sun, Fengjie Xi, Zebin Ren, Zhiqiang Chen, Qiang Peng, Hongbin Chen, Longde Guo, Qisheng Lu

Proceedings Volume 8904, 890411 (2013) https://doi.org/10.1117/12.2034249

KEYWORDS: Thermal blooming, Atmospheric propagation, Thermal effects, Laser beam propagation, Numerical simulations, Refractive index, Thermography, Wave propagation, Beam propagation method, Computer simulations

Read Abstract +

Proceedings Article | 20 November 2009 Paper

Analysis for angle anisoplanatic effect of the steady thermal blooming

Yunqiang Sun, Fengjie Xi, Xiaojun Xu, Qisheng Lu, Wuming Wu, Hongbin Chen

Proceedings Volume 7511, 75111D (2009) https://doi.org/10.1117/12.837820

KEYWORDS: Thermal blooming, Distortion, Thermal effects, Gaussian beams, Zernike polynomials, Atmospheric propagation, Error analysis, Laser beam propagation, Wavefront distortions, Turbulence

Read Abstract +

Showing 5 of 6 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years