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PIV法とLIF法の併用によるEHL油膜内の冷媒溶解濃度変化現象の解明

结合PIV法和LIF法阐明EHL油膜中制冷剂溶解浓度变化现象

基本信息

批准号：
17760116
负责人：
田中真二
金额：
$ 2.24万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Young Scientists (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

项目摘要

本研究はPIV法(粒子画像流速測定法)とLIF法(レーザ誘起蛍光法)を併用して、冷媒ガスが溶解した冷凍機油の潤滑下で、ヘルツ接触域近傍の流れ空間の速度分布及びEHL(弾性流体潤滑)油膜内の冷媒溶解濃度を測定し、EHL油膜内の速度場と冷媒溶解濃度分布の関係から、EHL油膜内で冷媒溶解濃度が変化する現象を解明することを目的とする。今年度は、現有する顕微FT-IR用の冷媒雰囲気下EHL油膜観察装置を改造し、これと前年度に開発したPIV/LIFシステムを組み合わせた、冷媒雰囲気下EHL油膜内の速度・濃度分布測定装置を開発した。本装置を用いて、冷凍機油(POE)とフロン(HFC-134a)の雰囲気下で、EHL油膜内の速度分布と冷媒溶解濃度分布の同時測定を行った。従来の顕微FT-IRを用いた冷媒溶解濃度分布の測定結果と比較した結果、本測定結果の妥当性を確認できた。また、速度場と冷媒溶解濃度分布の関係について検討を行った結果、両者間には特に関係性は無いことがわかった。次に、EHL油膜内で冷媒溶解濃度が変化する現象のメカニズムについて理論的検討を行った。EHL油膜内の冷媒溶解濃度分布は速度分布と関係性が無かったことから、以下の解析モデルを考案した。(1)摺動部でヘルツ接触圧を受けて油膜粘度が非常に高くなり、回転円筒の表面に油膜が固着する。(2)キャビテーションにより固着油膜内の冷媒溶解濃度が急激に減少する。(3)雰囲気の冷媒ガスが固着油膜内に溶解して、固着油膜内の冷媒溶解濃度が増加する。(4)接触域入口では、回転円筒の表面に固着した粘度の高い油膜が優先的に接触域内に引き込まれる。(5)円筒の回転速度が増加すると、(2)の濃度減少が(3)の濃度増加を上回り、その結果、潤滑膜内の冷媒溶解濃度が減少する。本解析モデルに基づいて、レイノルズ方程式と拡散方程式を組み合わせた冷媒溶解濃度解析及び接触域入口における2次元流れ解析を行った結果、測定結果と定性的に一致することが確かめられた。

In this study, the PIV method (Particle Imaging Velocity Measurement Method) and the LIF method (LIF method) were used together, the refrigerant was dissolved in the refrigeration oil, the refrigeration oil was lubricated, the velocity distribution in the flow space near the contact area, and the EHL (Elastic fluid lubrication) The measurement of the dissolved refrigerant concentration in the oil film, the relationship between the velocity field and the distribution of the dissolved refrigerant concentration in the EHL oil film, and the explanation of the phenomenon of the change of the dissolved refrigerant concentration in the EHL oil film. This year, the existing EHL oil film observation device for micro FT-IR under a refrigerant atmosphere will be renovated and will be renovated in the previous year. The PIV/LIF system is equipped with a speed and concentration distribution measuring device for measuring the velocity and concentration distribution in the EHL oil film under a refrigerant atmosphere. This device is used to simultaneously measure the velocity distribution of refrigeration oil (POE) and HFC-134a (HFC-134a), the velocity distribution in the EHL oil film, and the refrigerant dissolved concentration distribution. The micro FT-IR used in this experiment uses the measurement results of the refrigerant dissolved concentration distribution and compares the results, and confirms the validity of the measurement results. The relationship between velocity field and refrigerant dissolved concentration distribution is the result of the relationship between the velocity field and the refrigerant dissolved concentration distribution. The relationship between the two is the same. Secondly, the phenomenon of changing the refrigerant concentration in the EHL oil film is based on the theory of changing the refrigerant concentration in the oil film. There is no relationship between the refrigerant solution concentration distribution and velocity distribution in the EHL oil film. The following analysis is based on the test case. (1) The contact pressure of the folding part is affected by the fact that the oil film viscosity is very high, and the oil film on the surface of the return cylinder is not fixed. (2) The dissolved concentration of the refrigerant in the fixed oil film is rapidly reduced. (3) The refrigerant in the atmosphere is dissolved in the fixed oil film, and the dissolved refrigerant concentration in the fixed oil film is increased. (4) The entrance of the contact area and the surface of the return cylinder are fixed and the oil film with high viscosity is preferred in the contact area. (5) The return speed of the cylinder is increased and the refrigerant concentration in the lubricating film is reduced. (3) The concentration is increased and the refrigerant concentration is reduced. This analysis shows the analysis and connection of the モデルにbased づいて, the レイノルズ equation and the loose equation を合わせた refrigerant concentration. The results of the analysis of the 2-dimensional flow at the entrance of the contact field and the measurement results are qualitative and consistent.