Millimeter wave system has many distinct advantages such as miniaturizing system components , increasing frequency band width , providing higher detectability , uneasily influenced by atmosphere conditions , etc . this makes millimeter wave technique get the increasingly extensive application in radar , communications , electronic warfare , guidance , remote sensing , radiation survey , therefore the research of millimeter system is very vital for civil , the industry , national defense 毫米波系统具有可以使元部件小型化、增加系统带宽、提供高分辨率以及受大气条件的影响较小等许多明显的优点,这使得毫米波技术在雷达、通信、对抗、制导、遥感和辐射测量等技术领域中得到日益广泛的应用,所以毫米波系统的研究对于民用、工业、国防具有重要的意义。
The pate rubs pinches massages the head , revolves the massage through the pro and con two directions , the waist , the back is equipped with four turn walks the organization , two widths , two narrowly roll the massage wheel , can tightly paste your waist back about , does according to the lumbodorsal region curve walks the massage , depend the mat . the beginnings and ends are equipped with the remote infrared ray pad wave system , can cause the heat wave infrared thorough human body cell in - depth to nurse , the cushion thigh department is equipped with two thumps to strike to be possible to choose the rap , to inspire trembles , whips three massages techniques , the calf pad supposes one may modulate velocity the hoop organization 颈部揉捏按摩头,通过正反二个方向的旋转按摩,腰、背部设有四轮行走机构,两宽、两窄滚动的按摩轮,能紧贴您的腰背部,根据腰背曲线作上下行走按摩,靠垫两端设有远红外线垫波系统,能使热波红外线深入人体细胞深层护理,坐垫大腿部设有两捶击头可选择敲击、振颤、拍打三种按摩手法,小腿垫设一可调速滚轮机构。
Great difference in pressure for two flow made pressure wave system and it help to extend the delay time for gas in chamber , which increases combustion effusion . second , to increase combustion effusion , the inlet temperature of air and gas should be enhanced in the range of heat releasing in chemical reaction . third , the first work condition is unburned absolutely and the second work condition is burnt in shear layer of inlet and the end of down wall zone in straight segment 对于压力差很大的两股气流,所形成的压缩波系的结构可以增加燃气驻留时间,提高燃烧稳定性;为了提高扩散燃烧的效率,在保证能放热的化学反应温度范围之内,应适当提高燃气及空气的来流入口温度;燃气喷嘴应居于燃烧室轴线上,是改进超音速燃烧室结构的一种思路。
In the study of directional spectrum and reflection coefficient of multidirectional wave , firstly the wave elevation trains overlapped by the incident wave and the reflected wave of multidirectional wave are simulated in the method of a frequency corresponding to a direction . then the composed wave trains are analyzed respectively by the mbdm and the mmlm . during the numerical study , the input factors include the various wave parameters , the different measuring wave system and the various reflect characteristic 在多向不规则波入射波方向谱和反射系数的分析研究中,利用方向频率对应法模拟了多向不规则波入射波与反射波叠加的波面序列,将此合成波列分别应用mbdm和mmlm进行分析,通过输入各种波浪参量、不同波浪测量系统和各种反射特性等因子,检验了mbdm和mmlm方法的适用条件,对两种分析方法的性能进行了比较分析。
The complex vortex system structure and shock wave system structure inside this rotor is obtained . wall flow patterns on the blade surface and hub surface are found out . the complex vortex system structure , such as horseshoe vortex , passage vortex , corner vortex and trailing vortex , and the interaction with shock wave system are researched . especially , the character of the tip clearance flow inside the rotor passage is revealed , and the interaction between shock wave and tip clearance flow near blade tip and the evolution of tip clearance flow are considered 给出了叶片表面及轮毂面上的壁面流型,分析并揭示了转子叶道内的马蹄涡、通道涡、角涡、尾涡等复杂涡系及其与激波的相互干涉;特别是,分析并揭示了转子叶道内顶隙射流的特点,得到了顶隙附近激波与泄漏流动的干涉形态及泄漏流动的发展,并着重给出了其与激波的干涉形态。