柱形容器开口泄爆过程中压力发展特性的实验研究

在体积为0.025m~3的柱形容器中，采用底端中心点火方式，对4.1%的丙烷-空气、9.5%甲烷-空气预混气的顶端开口泄爆过程进行了实验研究。实验结果给出了不同泄爆面积和不同泄爆压力条件下容器的内压力发展历史。就不同泄爆条件对容器内爆炸发展产生的影响进行了讨论

微重力沸腾传热研究:现状与展望

沸腾现象具有很高的传热系数,在众多工程技术领域获得了广泛的应用,其中,航天技术领域的应用需求,极大地激励了微重力沸腾传热研究,使其成为微重力科学和传热学研究领域的前沿

Dynamics of discrete bubble in nucleate pool boiling on thin wires in microgravity

A space experiment on bubble behavior and heat transfer in subcooled pool boiling phenomenon has been performed utilizing the temperature-controlled pool boiling (TCPB) device both in normal gravity in the laboratory and in microgravity aboard the 22(nd) Chinese recoverable satellite. The fluid is degassed R113 at 0.1 MPa and subcooled by 26 degrees C nominally. A thin platinum wire of 60 mu m in diameter and 30 mm in length is simultaneously used as heater and thermometer. Only the dynamics of the vapor bubbles, particularly the lateral motion and the departure of discrete vapor bubbles in nucleate pool boiling are reported and analyzed in the present paper. It's found that these distinct behaviors can be explained by the Marangoni convection in the liquid surrounding vapor bubbles. The origin of the Marangoni effect is also discussed

EXPERIMENTAL STUDY ON SUBCOOLED POOL BOILING IN MICROGRAVITY UTILIZING THE DROP TOWER BEIJING （NMLC）

本文研制了一套控温池沸腾实验设备，利用中国科学院国家微重力实验室落塔开展了短时微重力环境下的过冷池沸腾传热实验研究。加热元件为长30mm、直径60μm的铂丝。实验工质为0.1MPa压力下过冷度为24℃的R113。在地面常重力和落塔短时微重力实验中，观测到核态沸腾和双模态过渡沸腾现象。对核态沸腾，微重力传热效果稍有增强而汽泡形态却呈现出剧烈变化。对双模态过渡沸腾，微重力下膜态沸腾部分有明显收缩，但热流密度值仍比常重力时减小20％

过冷池沸腾传热研究：I、地面常重力实验

针对我国返回式卫星搭载实验条件，我们研制了一套池沸腾实验装置初样（包括液池、壁温自动反馈控制系统等）和地面实验配套系统，以研究地面常重力和空间微重力条件下的过冷池沸腾传热规律，着重研究核态沸腾、临界热流密度和双模态过度沸腾等。本文采用恒流电源加热、恒压电源加热和壁温自动反馈控制等三种加热方式，实验研究了地面常重力环境中池沸腾现象及其传热规律。实验结果证明该装置能满足空间搭载实验的要求，实验结果具有良好的重复性。关于稳定双模态过渡沸腾，本文研究发现，在过冷条件下起其表现和文献报道的饱和条件时具有明显的差异，沸腾特征曲线具有一明显的极小值，其位置紧邻临界热负荷点。本文还对此进行了初步的理论探讨

Pool Boiling in Microgravity: Recent Results and Perspectives for the Project DEPA-SJ10

Two research projects on pool boiling in microgravity have been conducted aboard the Chinese recoverable satellites. Ground-based experiments have also been performed both in normal gravity and in short-term microgravity in the Drop Tower Beijing. Steady boiling of R113 on thin platinum wires was studied with a temperature-controlled heating method, while quasi-steady boiling of FC-72 on a plane plate was investigated with an exponentially increasing heating voltage. In the first case, slight enhancement of heat transfer is observed in microgravity, while diminution is evident for high heat flux in the second one. Lateral motions of bubbles on the heaters are observed before their departure in microgravity. The surface oscillation of the merged bubbles due to lateral coalescence between adjacent bubbles drives it to detach from the heaters. The Marangoni effect on the bubble behavior is also discussed. The perspectives for a new project DEPA-SJ10, which has been planned to be flown aboard the Chinese recoverable satellite SJ-10 in the future, are also presented

过冷池沸腾落塔短时微重力实验研究

本文研制了一套控温池沸腾实验设备，利用中国科学院国家微重力实验室落塔开展了短时微重力环境下的过冷池沸腾传热实验研究。加热元件为长30mm、直径60μm的铂丝。实验工质为0.1MPa压力下过冷度为24℃的R113。在地面常重力和落塔短时微重力实验中，观测到核态沸腾和双模态过渡沸腾现象。对核态沸腾，微重力传热效果稍有增强而汽泡形态却呈现出剧烈变化。对双模态过渡沸腾，微重力下膜态沸腾部分有明显收缩，但热流密度值仍比常重力时减小20％

双模态过渡池沸腾实验研究

实验研究了常压（1atm）、室温（16℃）条件下R113过冷池沸腾传热现象，着重研究了核态沸腾和膜态沸腾共存的稳定双模态过渡沸腾现象，并与饱和双模态沸腾传热进行了比较。本文实验研究了常压(latm)、室温(16℃)条件下R113过冷池沸腾传热现象,首重研究了核态沸腾和膜态沸腾共存的稳定双模态过渡沸腾现象,并与饱和双模态沸腾传热进行了比较

Prediction of Premixed Flame Propagation in a Vented Cylindrical Vessel

A numerical model based on k - Ε turbulent model and EBU-Arrhenius turbulent combustion model is applied to simulate the venting process in cylindrical vessel (L/D =5.6).The flow fields of venting occurred at venting pressure of 0.02 MPa through different vent area show that during venting process the flame propagation and deformation is intensified by a venting induced flow; vent area is the main factor for determining the vent inducing flow. Small vent area and low venting pressure produce weak venting induced flow; large vent area usually produces a relatively strong venting induced flow; even the venting pressure is low. The squish flow and reverse flow which induced the velocity gradient is the possible mechanism of tulip flame