Taking some tubular air pre - heater used in one boiler whose capacity is 130 t / h as an example , new blue print with inner trachea is completed by means of computer program . several key design variables may be changed , such as diameter of pipe and velocity of flow of gas . these cases have been considered , and their results have also been compared with each other 比较了几个重要的设计变量，如外管径、烟气流速等参数变化时，总传热系数和空预器本体管子总重量，阻力损失以及最低管壁温度等几个重要设计结果的变化趋势，对内螺纹管空气预热器的设计具有借鉴意义；其间还分析了内螺纹管与光管在设计时的不同之处；最后，初步分析了内螺纹管的优化设计问题，提出了一些建议。
( 4 ) thermal pipelines are important parts of concentrated heat supply of the thermoelectricity combination . according to the thermal lube service prospect , the paper calculates thickness of the buried steam pipe , proposes a new opinion of the interface temperature controlling method , and also attempt to determine the resistance loss of the minimal steam tubes and wrote its program ( 4 )热力管网是热电联产集中供热系统的重要组成部分，本文根据热力管道的发展趋势，对直埋蒸汽管道的保温层厚度计算，提出采用界面温度控制法的见解，并进行编程计算，此外，还对直埋蒸汽主管道阻力损失进行编程计算的尝试。
Meanwhile , it puts forward the exact demand to the indicators of coal for gasification . it systematically studies the thickness of economical heat preservation and calculation process of resistance loss of delivery pipe for analyzing and appraising the techno - economic of hot coal gas ' s delivery pipes . it sets the mathematic model for the calculation of economical heat preservation thickness and resistance losses of conveying pipes , compiles the computer program , dutti and dutt2 and draws the block diagram of relevant computer program 为便于热煤气输送管道的技术经济分析与评价，对输送管道经济保温厚度和输送管道阻力损失的计算过程，进行了系统的研究，建立了输送管道经济保温厚度和阻力损失计算的数学模型，绘制出相应的计算机程序框图，编制了计算机程序dutt _ 1和dutt _ 2 ；并对热煤气的混合燃烧过程进行了研究。
For the case of transporting suspended fine sand , a single - fluid model is used to calculate the flow resistance by solving the navier - stokes equations . the computed agrees well with the measured . and for the case of transporting medium - sized sand , a two - layer model is used and the model produces a good agreement with the experiment data 对管道输送细沙悬移质的流场，采用单流体模型进行数值求解n - s方程，计算结果与实验资料相吻合;对具有分层流动的中沙管道水力输送，采用两层代数模型进厅了计算分析，阻力损失的预测结果与实验吻合较好;最后对管道输送粗沙的阻力特性和运动机理进行了分析探索，提出了进一步研究的方向。
Abstract : apply computer simulation to the distribution pattern of air - flow without considering the cold condition of the combustion and compare the flow patterns under different designed circumstances . and the effect of the design of the partition in the air way of the burner on the flow and mixture of gas and air is especially studied . the result shows that the design of partition plays a very important role in strengthening the mixture of gas and air , but increases the loss of the resistance in the air way and the total pressure of the air way in same working conditions needs increasing 文摘:应用计算机模拟的方法，在不考虑燃烧的冷态情况下，研究了热风炉燃烧室内的气流分布规律.在此基础上，比较了2种不同设计方案的气流流动特征，尤其是研究了燃烧器空气通道内阻流板的设置与否对空气和煤气的流动和混合的影响.结果表明，阻流板的设计对加强空气和煤气的混合有着极为重要的作用，同时也增加了空气管道的阻力损失，在同样的工况条件下需要提高管道系统的总压力
In theory , the noise elimination capacity is calculated by the method which the characteristic equation of noise elimination of the dissipative silencer is translated into the constant differential eguation . and the project simulates and calculates the distributing thing of interior velocity of flow by the finity element 在理论上，采用了将阻性消声器的消声量特征方程转化为常微分方程的计算方法计算消声量；在计算阻性消声器的阻力损失时，运用了有限元数值模拟的方法模拟计算了简化消声器模型内部流场流速的分布情况，并由此得到其动态阻力损失。
The principle and design scheme are described , the corresponding experimental research is conducted and application foreground of the rotary - switching regenerator is analyzed the result indicates that rotary switching regenerator has the advantages of continual gas supply , low leakage rate , low pressure drop and compact equipment 研究结果表明档位蓄热器具有以下特点：可实现对炉窑的连续供气，保证了炉内火焰的稳定性，从而使炉内工况不易波动；另外系统的漏风率较低，阻力损失也较低，并且设备紧凑、操作安全可靠，易于实现标准化生产。
Respective simulation of the liquid cooling system and the circulatory system of cooling fluid , which mainly concerns the simulation model of the four major components in the refrigerating system and the water pumps and heat exchangers in the cooling circulatory system . experimental research of the assembled system of liquid cooling system , which yields the system perform parameters of refrigerating capacity and resistance loss in different working conditions . collection and comparison of the experimental data got from simulation and experimental research , which proves simulation and the experiment result are well tallying , hereby , testifies the emulational veracity of the cooling system 主要对制冷系统中四大部件和冷却液循环系统中的水泵、换热器进行了数学建模;利用组装的液冷源系统进行实验研究,得到不同的工况下系统的制冷量、阻力损失等系统性能参数;对仿真和实验研究中得到的大量实验数据进行汇总比较,发现仿真和实验结果吻合较好,验证了液冷源系统仿真的准确性。
But because it is not spreading popularize and new type pipe in market emerge in an endless steam , the selling market is not standard , many pipe material has not standard temporary . how to choose suitable pipe materials that it is not only the ordinary use do n ' t know but also relevant design and construction technician can not know comprehension 而且厂家生产与销售市场又不够规范，很多管材暂无设计规程与施工验收规范。要想选用适用的管材，正确进行设计和施工，需要研究新型管材的耐热、耐压、膨胀和阻力损失等物理性能。
