旋转式战术导弹马格努斯效应的实验研究

本文介绍了旋转弹在低速风洞中 Magnus 效应的实验研究结果。通过不同组合体的实验,如光弹,“一”字型前翼+强身,弹身+“十”字型尾翼,“一”字型前翼+弹身+“十”字型尾翼,分别研究了旋转对弹纵向气动特性的影响及弹的 Magnus 效应特性。     

论实验室模具的技术改造

通过分析现有的实验条件，提出并论述了实验室模具技术改造的必要性，阐述了模具技术改造的方案，以及模具改造方案的具体实施过程。     

EXPERIMENTAL INVESTIGATION ON R134A AIRBORNE VAPOR-COMPRESSION REFRIGERATION SYSTEM

The airborne high power electrical equipments have been widely used in modern aircrafts, which conse- quently causes the dramatic increase of heating load up to dozens of kilowatts. Accordingly, vapor-compression re- frigeration system （VCRS） with lower engine bleed air and larger refrigeration capacity has been paid much atten- tion in recent years. Therefore, based on the analysis of the characteristics of VCRS, an experiment system of VCRS using R134a is set up to simulate operation performances. The influences of different parameters including evaporation pressure, condensing pressure, refrigerant mass flow rate and compressor rotation speed are also in- vestigated. The impacts of different parameters on the system performance are various. This work can help to es- tablish the specific control law under different work conditions.     

Development of a CELSS Experimental Facility

A CELSS Experimental Facility was developed two years ago. It contains a volume of about 40.0 m³ and a cultivating area of about 8.4 m²; its interior atmospheric parameters such as temperature, relative humidity, oxygen concentration, carbon dioxide concentration, total pressure, lighting intensity, photoperiod, water content in the growing-matrix, CO₂-added accumulative amount, O₂-released accumulative amount and ethylene concentration are all controlled and logged automatically and effectively; its growing system consists of two rows of racks along its left-and-right sides separately, each side holds two upper-and-lower layers, and the vertical distance of each growing bed can be adjusted automatically and independently; lighting sources consist of both red (95%) and blue (5%) light-emitting diodes (LED), and the average lighting intensity of each lamp bank at 20-cm distance position under it, reaches to 255.0 μmol m⁻² s⁻¹. After that, demonstrating tests were carried out and were finally followed by growing lettuce in the facility. The results showed that all subsystems operated well and all parameters were controlled automatically and efficiently. The lettuce plants in the system could grow much well. Successful development of this system laid a necessary foundation for future larger-scale studies on CELSS integration technique.     

对大学生就业心理的调查与思考

通过对大学生就业心理的调查问卷,结合各项数据,全面分析了当前大学生就业过程中表现出来的心理特点,提出了高校针对大学生就业心理应开展的相关辅导工作。     

飞机维护教学软件在教学中的应用

利用现代计算机技术，结合民航的行业特点，介绍了飞机维护CBT教学的优点和学院CRT教学的应用情况和发展前景，为发挥职业院校的优势和培养适应现代航空发展的飞机维修人才提供了一个切实有效的方法。     

亚细亚商场顾客情况调查分析及其对策

郑州亚细亚商场凭借其特有的外部环境和内部机制,能够迅速适应市场形势变化,率先在最贴近市场和消费者的方位确立了全新的经营坐标。本文力求通过对亚细亚商场顾客情况的调查结果进行客观地分析,找出产生这种姑果的原因及其同商场所采取的一系列策略之间的联系,反映顾客的看法,明确经营差距,寻求最佳对策,全文包括顾客构成、成交情况,顾客消费心理和顾客心目中的企业形象四个部分,并对塑造企业形象、加强定价策略和广告的研究以及专设学生服装部等方面,作了较为详细的阐述和分析,期望有益于实践。     

基于转捩模型的吸附式压气机正弯叶片数值研究

采用三维数值方法研究了吸附式压气机扇形叶栅中正弯叶片的流场和气动性能,通过对比分析三种不同的孔式抽吸方案,以探讨附面层抽吸抑制三维流动分离、减小损失的机理。首先通过与前期实验数据的对比,校核了数值计算代码的可靠性,所得到的流场特性与实验数据有较好的一致性;其次通过在常规直叶片和正弯叶片中采用孔式附面层抽吸方法,以对比不同叶片积迭形式时附面层抽吸的效果,并探讨了通过改善抽吸设计方案提高抽吸效果的机理。结果表明,采用孔式抽吸可以较好地控制直、弯叶栅内的三维流动分离,抽吸后的吸力面气泡式分离消失,每个抽吸孔下游形成了新的基于抽吸孔特征的分离流动结构;抽吸策略的调整改善了角区的三维流动分离,尾迹旋涡的发展以及强度得到有效抑制。     

The Experimental Satellite on Electro-magnetism Monitoring

The Experimental Satellite on Electromagnetism Monitoring (ESEM) was proposed in 2003 and proved in 2013 after 10-years' scientific demonstration. The ESEM mission was proposed to be the first satellite of space-based geophysical fields observation system in China with a lot of application prospects in earthquake science, geophysics, space sciences and so on. And coincide with the mission objectives, the satellite decides to use the Circular Sun Synchronous Orbit with an altitude of 507km and descending node time at 14:00LT. The payload assemble includes 8 instruments, Search-Coil Magnetometer, Electric Field Detector, High precision Magnetometer, GNSS occupation Receiver, Plasma Analyzer, Langmuir Probe, Energetic Particle Detector, and Three-frequency Transmitter. According to the planned schedule, the satellite is due to be launched in 2016-2017 and will be onboard operated for 5 years.      

Experimental investigation of transient thermal behavior of an airship under different solar radiation and airflow conditions

Knowledge of the thermal behavior of airships is crucial to the development of airship technology. An experiment apparatus is constructed to investigate the thermal response characteristics of airships, and the transient temperature distributions of both hull and inner gas are obtained under the irradiation of a solar simulator and various airflow conditions. In the course of the research, the transient temperature change of the experimental airship is measured for four airflow speeds of 0 m/s (natural convection), 3.26 m/s, 5.5 m/s and 7.0 m/s, and two incident solar radiation values of 842.4 W/m² and 972.0 W/m². The results show that solar irradiation has significant influence on the airship hull and inner gas temperatures even if the airship stays in a ground airflow environment where the heat transfer is dominated by radiation and convection. The airflow around the airship is conducive to reduce the hull temperature and temperature nonuniformity. Transient thermal response of airships rapidly varies with time under solar radiation conditions and the hull temperature remains approximately constant in ∼5–10 min. Finally, a transient thermal model of airship is developed and the model is validated through comparison with the experimental data.