航空發(fā)動(dòng)機(jī)專業(yè)英語之空氣動(dòng)力學(xué)-資料下載頁
2025-01-07 06:52本頁面
【正文】 perties ? In order to determine if the aerodynamic forces on an object are sufficient to allow flight, the forces must be measured, The different contributions of the fluid moving around the object must be categorized and defined, and they must be quantified. There are specific qualities that are used to categorize and define these contributions. In the Measurements section, units were introduced to help quantify these qualities. In this section, these qualities, or properties, of a fluid are defined, These definitions will use the units defined in the previous section. ? Before the aerodynamic forces on an object can be puted, the properties of the fluid must be defined. These properties include the temperature, pressure, density and viscosity of the fluid. The values of the aerodynamic forces are dependent on defining the conditions of the problem. In addition, several other quantities are defined to help further understanding of aerodynamics. These include weight and gravity, velocity, and acceleration. ? viscosity 黏性，黏度 ? quantity 數(shù)量，數(shù)目 ? gravity 重力 ? velocity 速度 ? acceleration 加速度，促進(jìn)作用 Temperature ? The temperature of the fluid is an important part of how the fluid behavior. Hot oil, for example, flows faster than cold oil. Warm air rises and cold air drops in a room。 house designers often place heat vents at the floor level because of this. Very cold water is lighter than cool water, so it rides to the top of a lake. That’s why lakes freeze from the surface down. Sound travels farther on cold days than hot days. ? It Is crucial then, to know the temperature of the fluid when puting aerodynamic quantities. As mentioned in the Measurements section, temperature has units of degrees Fahrenheit or degrees Celsius. ? behavior 行為，狀態(tài) ? vent 通風(fēng)，通氣 ? lighter 更輕 ? crucial 有決定性的，極重要的，嚴(yán)重的 ? Fahrenheit 華氏溫標(biāo) Celsius 攝氏溫標(biāo)
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