考虑弹性变形的光敏树脂风洞模型设计方法.pdf

第47卷第8期
机械工程学报
Vol47 No 8
2011年4月
JOURNAL OF MECHANICAL ENGINEERING
Ap!
DOI:10.3901/JME.2011,08,169
考虑弹性変形的光敏树脂风洞模型设计方法
孙岩张征字2朱伟军2王超李涤尘2赵星磊
(1.空气动力学国家重点实验室绵阳621000
2.西安交通大学机械制造系统工程国家重点实验室西安710049
摘要:为减小光敏树脂刚度较低引起的模型变形对风气动力试验数据的影响,提出一种考虑弹性变形的光敏树脂风洞模型
设计方法。采用气动弹性数值讣算的方法对光敏树脂模型在空气动力作用下的变形进行预测,基于数值计算的变形修正模型
的原始外形,获得树脂模型的制造外形,使制造外形的模型在气动力作用下变形后的外形与原始外形相同,从而消除树脂模
型弹性变形的影响。棊于该方法和大展弦比机翼剖面刚性不变形假设设计出6套F4模型的制造外形,通过快速成形设备进
行制遊,并在FL-2L跨声速风洞中进行验证试验。试验数据表明,在设计点时,4#、5#、6#模型的开力系数CL与四外风洞
数据物合较好,1#、2#、3#和5#模型的俯仰力矩系数Cmy与国外风洞数据吻合较好;在非设计点时,模型的C1和Cm与国
外数据偏差较大:同国外风洞试验衛诺数的差异使阻力系数比国外风洞试验的阻力系数大。因此,没计点时考虑弹性变形
的方法可以明显改善光敏树脂风洞模型的气动力试验数据精度。
关鍵词:弹性变形光敏树脂风洞模型气动弹性算
中图分类号:V21!.7
Design Method for Photosensitive Resin Wind Tunnel Model Considering
Elastic Deformation
SUN Yan" ZHANG Zhengyu" ZHU WEIJUN'WANG Chao L! Dichen'zhao Xinglei
(1. State Key Laboratory of Aerodynamics, Mianyang 621000
2. State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi, an 710049
Abstract: A method for designing photosensitive resin wind tunnel model considering elastic deformation is presented to reduce the
eftect of model deformation caused by low stiffness of photosensitive resin on aerodynamic force experiment data in wind tunnel
Numerical calculation method for aeroelasticity is used to predict the model deformation under aerodynamic force and the original
modei shape is modified on the basis of the numerically calculated deformation, thereby the manufacture shape of resin model is
obtained, so that the shape of model after deformation under aerodynamic force is same as the original model shape, thus eliminating
the effect of photosensitive resin elastic deformation. Six F4 model manufacture shapes are designed on the basis of this method and
the hypothesis that the airfoil of large aspect ratio wing is rigid. Six models are manufactured by using rapid prototyping equiprnent and
tested in FL-2I transonic wind tunnel. Test data show that at design point, lift coefficients L of 4, 5# and 6#models are in good
agrecment with the data of three foreign wind tunnels, and so are the pitch moment coefficients m of 1# 2, 3#and 5#models; at
off-design points, Ct and my are quite different from the foreign data; drag coefficients Ca are greater than foreign wind tunnel results
because of Reynolds number Re difference between this test and foreign wind tunnel tests. So, at design point, this method can
obviously improve the aerodynamic force data precision of photosensitive resin wind tunnel modek
Key words: Elastic deformation Photosensitive resin Wind tunnel model Calculation of aeroelasticity
环节,准确的风洞试验数据是保证飞行器设计成功
0前
的关键。风洞模型是风洞试验的对象,是获得精准
试验数据的前提,但其研制周期占据了气动布局设
风洞试验是飞行器气动布局设计不可缺少的计周期的70%,已经成为提升飞行器概念设计速度
的瓶颈。
长江学者和创新闭队发展计划(1RT0646)、国家自然科学基金
目前,国外研硏究机构?泛展开风洞模型的快速
(51075385)和空气动力学国家重点实验室基金(SKLA2009%A0103)资
。20101023收到稿,20110120收到修改稿
制造方法研究,而光固化( Stereo lithography.SL)快