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 Starting from the characteristics of the air resistance coefficient of the lowspeed bullet, approximate to a constant, this paper simplifies the basic equations of the exterior ballistics, introduces a series of formulas of the characteristics of the lowspeed and flat trajectory at any point and furthermore finds the solutions of the data of the vertex, falling point, direct fire range and the exteriorballistic design methods of the rifle grenades. It provides a simple method of the solution of... Starting from the characteristics of the air resistance coefficient of the lowspeed bullet, approximate to a constant, this paper simplifies the basic equations of the exterior ballistics, introduces a series of formulas of the characteristics of the lowspeed and flat trajectory at any point and furthermore finds the solutions of the data of the vertex, falling point, direct fire range and the exteriorballistic design methods of the rifle grenades. It provides a simple method of the solution of the closerange antitank weapons widely used today. Calculation examples are given in the appendix.  本文从低速弹丸的阻力系数近似为常数的特点出发,简化外弹道基本方程,导出一组求解低速低伸弹道任意点诸元的公式,进而找出求解弹道顶点诸元,落点诸元,直射距离的计算方法和枪榴弹外弹道设计方法。为目前广泛使用的近战反坦克武器提供了一种简便的外弹道解法。并列举了计算示例。  the falling trajectory of coke, sinter and pellet have been measured by means of highspeedphotography in an experimental 1:1 model of the charging device of a blast furnace. A theoreticalcalculated equation has been checked and derived. The range of selective value of calculatingequation has been recommended. It was discussed that the relationship between the falling point and the depositing peak positionof charge on the stockline level and the variation of peak position when the furnace is on blast.... the falling trajectory of coke, sinter and pellet have been measured by means of highspeedphotography in an experimental 1:1 model of the charging device of a blast furnace. A theoreticalcalculated equation has been checked and derived. The range of selective value of calculatingequation has been recommended. It was discussed that the relationship between the falling point and the depositing peak positionof charge on the stockline level and the variation of peak position when the furnace is on blast. It was pointed out that the peak position will move toward outside under the influence of walland resistance of gas flow and the formation of the‘V’shape profile of stockline level in the largeblast furnace. So it is necessary for large blast furnace to employ movable armour or belllessdistribution technique. When sinter and pellets were used, the principle in the design of the large bell angle is to makethe falling point of charging burden reach the largest horizontal distance from the center of furnace.Thus, the optimum slope angle of large bell should be in the range of 4248 degrees.  在1:1的装料装置模型中,用快速摄影方法实测了焦炭、烧结矿和球团矿的落下轨迹。校验和推导了理论计算公式;推荐了计算参数的取值范围。讨论了炉料落点与料面形成堆尖位置的关系和送风条件下堆尖位置的变化。指出堆尖位置受炉墙和煤气阻力的影响而向外移,因而认为大型高炉基本上形成V型料面,采用变径炉喉或无钟布料技术是必要的。在使用烧结矿和球团矿条件下,大钟倾角的设计应以获得炉料落点水平距离最大为原则,因而适宜倾角在42°～48°之间。  An experimental test of distribution was carried out by using an 1:6 model bellless top similarto that of new No.2 blast furnace of Shoudu Iron and Steel Co. The profile of the layered burdenmaterials prior to blowingin of the furnace was measured and recorded. Parameters, such as the effective working range of the chute angles (α), the relationship between α and the falling points ofcharging materials and the size of opening of the material flow regulating valves for different batchweights of burden... An experimental test of distribution was carried out by using an 1:6 model bellless top similarto that of new No.2 blast furnace of Shoudu Iron and Steel Co. The profile of the layered burdenmaterials prior to blowingin of the furnace was measured and recorded. Parameters, such as the effective working range of the chute angles (α), the relationship between α and the falling points ofcharging materials and the size of opening of the material flow regulating valves for different batchweights of burden materials was closely examined. The functions and interrelations among the chuteangles, heigtri of stock lines, batch weights and the material distribution at the different stock linelevels, were further understood. During the first halfyear operation of the new No.2 blast furnace in 1980, it was going onsmoothly. By using a ring charging system, the analysis of B.F. top gas gave a CO_2 content of 18.5%in average, and the permeability of the stock (V/△P) was around 2100. Through this experiment, we found that the diameter of the central pipe should be big enough toget rid of choking of burden materials and coordinating with the material flow gate openings ratherthan avoiding the segregation of the charging materials. The length of the rotating chute should beable to make full use of the effective working range at all chute angles.  首钢新2号高炉通过1/6模型的布料试验和开炉布料测定,掌握了高炉布料面形状、旋转溜槽倾角a的有效工作范围、a角与料流落点的关系及矿、焦批重不同时的节流阀开度等工艺参数;对于a角、料线、批重和布料方法等的作用也加深了认识。开炉半年以来,高炉操作基本顺利。环形布料时,炉顶煤气中CO_2≈18.5,压量指数(V/ΔP)达到2100。通过试验,还认识到正确设计中心喉管直径的主要依据是防止卡料和同节流阀的面积相称,而不是防止偏料;一定条件下,溜槽长度的选取,应以a的工作范围全部生效为目的。   << 更多相关文摘 
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