| 1. | Abstract : an effective aerodynamic optimization design method of transonic airfoil is given
文摘:提出了一种有效的跨音速翼型气动优化设计方法。 |
| 2. | Aerodynamic optimization design of airfoils and wings using control theory approach can avoid the great computation time cost in the traditional approach when lots of design variables are required to solve the gradients
采用控制理论进行优化设计可以避免传统方法在多设计变量时求解梯度所花费的巨额时间。 |
| 3. | Aerodynamic optimization design technology based on cfd becomes a very active object in the cfd field . many optimization methods had been introduced in aerodynamic optimization design
基于cfd的气动优化设计已成为当前计算流体力学研究的一个重要领域，很多优化方法已被成功的运用于翼型、机翼和全机的气动外形设计，并取得了明显效益。 |
| 4. | Especially , the approximation model methods can be applied to the aerodynamic optimization design instead of the time - consuming computational fluid dynamics ( cfd ) analysis to shorten the design process and reduce the computational cost
在气动优化设计过程中，用该模型取代耗时的高精度的计算流体动力学分析，可以加速设计过程，降低设计成本。 |
| 5. | Our researches in this paper give the solution to the problems above . and we successfully finish the aerodynamic optimization . the advances achieved in this paper are as follows : solving the euler equation with lu - sgs implicit algorithm on unstructured grids , mesh reordering will bring on imbalance
本文在研究过程中,对上述问题提出了相应的解决方法,并研制了相应的计算程序,使得结合模拟退火算法与正交分解的优化设计过程获得了成功。 |
| 6. | Most of the aerodynamic optimization design technologies need to solve the euler / navier - stokes equations by hundreds times , which limits the development of the design method and its application . two efficient methods , multigrid method and parallel computation , were studied in present work . the main aspects of this dissertation are as follows : 1
通常优化设计需要成百上千次的调用流场求解程序，运用更准确的流动控制方程，如navier - stokes方程，进行设计会带来巨大的计算花费，这给方法的研究和实际地运用带来了很大的困难。 |
| 7. | The effective optimization design programs for different cases are developed by integrating the following several aspects which involves the flow analysis , adjoint equation solution , gradient solution , optimal arithmetic and grid generation . some practical design tests for airfoil and wing show that the continuous adjoint approach is very effective and useful method for aerodynamic optimization design . at the same time , we have done the research of aerodynamic optimum design for airfoils by using navier - stokes equations
( 4 )研究了基于控制理论和三维navier一stokes方程的优化设计理论，在计算坐标下详细推导了该优化设计理论，得到了计算坐标系下描述的共扼方程数学描述形式，并以给定目标压力分布的气动反设计为例，导出了相应的共扼方程边界条件，以及关键的梯度求解具体表达形式，为了求解方便，把计算空间上描述共扼方程表达形式变换到物理空间中进行描述，通过与ns方程表达形式对比分析，最终给出了一种直观的共辘方程表达方式。 |
| 8. | Recently , a great progress has been made in aerodynamic optimization design technologies based on computational fluid dynamics . the control theory approach advocated by antony jameson is the typical methodology among them . its major advantage is that the computation of the sensitivity derivatives of cost function with respect to design variables is nearly independent of the number of design variables , which greatly saves the computational cost
近年来，计算流体力学( cfd )设计技术得到较大发展，其中最有代表性方法是jameson发展的基于控制理论(伴随方法)的气动优化设计技术，其显著优点是目标函数对设计变量的梯度计算几乎与设计变量数目无关，从而大量节省了计算费用，并成为当前cfd领域的研究热点。 |
| 9. | In the aerodynamic optimization design of turbomachine , the approximation model methods enable to balance the computational cost and accuracy , whose successful applications in centrifugal compressor impeller , diffuser , and mixed - flow pump impeller designs are introduced to show a wide engineering foreground
基于统计学理论提出的近似模型方法有效地平衡了基于计算流体动力学分析的叶轮机械气动优化设计中计算成本和计算精度这一对矛盾，在离心压气机叶片扩压器、叶轮和混流泵叶轮设计等问题中得到了成功应用，展示了广阔的工程应用前景。 |
