压缩空气动力汽车的可行性分析

介绍了压缩空气动力汽车的工作原理,研究了空气动力发动机工作过程的能量利用,对高压空气的储存压力进行选取,并分析了环境温度、行驶速度、汽车总质量等因素对空气动力汽车续驶里程的影响,探讨了空气动力汽车的补充能源来源、经济性、安全性、结构布置等问题,认为压缩空气动力汽车在技术上是可行的,是一种具有应用前景的绿色汽车。     

气动式水下武器发射装置节流阀流通面积研究

为了研究气动式水下武器发射装置节流阀的流通面积对武器发射内弹道的影响规律,运用内弹道理论建立了该发射装置节流阀的流通面积计算数学模型,求取了节流阀流通面积随发射深度变化的调节规律,通过该发射装置的全系统仿真软件对调节规律进行实例验证．仿真结果表明,建立的数学模型与求取的规律是基本正确的,可解决该发射装置大深度发射武器时发射能量控制问题．     

气动式水下武器发射器内弹道优化研究

为实现气动不平衡水下武器发射器的发射阀优化设计，提出了基于遗传算法的气动不平衡水下武器发射器内弹疲乏优化的方法和数学模型，运用该方法对现有某气动不平衡水下武器发射器的内弹进行了优化计算，并进行了优化前后的发射器性能指标的对比，由此证明该方法的可行性，展现了该方法在发射阀优化设计中的应用前景。     

压缩空气/燃油混合动力发动机热力学分析

提出了一种压缩空气/燃油混合动力发动机概念,该发动机可以在压缩空气动力和内燃机两种模式下运行。运用理想热力循环理论建立了混合动力发动机两种工作模式的数学模型,并对平均指示压力及其他重要性能指标进行了仿真研究。仿真结果表明,两种工作模式下发动机的平均指示压力等主要性能指标与传统内燃机相近,而且能够实现两种工作模式的平稳切换,这说明压缩空气/燃油混合动力发动机是可行的,并能够达到节约燃油、减少尾气污染排放的目的。     

节能的空压机站

压缩空气作为干灰气力输送的原动力,在不影响输灰系统正常运行的情况下,通过建立压缩空气的空压机站,取消输送空压机单元制,可减少压缩空气生产量,减少空压机数量,达到节电、节能的目的。本文围绕着设计原理、改造依据和改造后节能效益分析三个部分展开讨论。     

压气作业在地铁盾构施工中的应用

结合广州地铁盾构施工实例,介绍了压气作业的原理及地质条件,简述了人闸的维护及安全装置等,探讨了压气作业在不稳定地层中更换刀具的情况,并阐述了压气作业中的常见问题及处理方法。     

Chemical Composition of Overhaul Smoke After Use of Three Extinguishing Agents

The effect of extinguishing agents on the composition of smoke from wood fires of different intensities was studied. Three agents were examined: water, a protein-based water additive, and a sulfonate detergent-based compressed air foam (CAF). Air samples were analyzed for volatile organic compounds (USEPA 502 list), aldehydes, polyaromatic hydrocarbons, acid gasses, CO, CO₂, SO _x , and total volatile hydrocarbons. Air concentrations of levoglucosan and methoxyphenols, which are specific products from burning cellulose and lignin, respectively, were also measured. Levoglucosan, methoxyphenols, and many of the polyaromatic compounds have not been previously reported in overhaul smoke. A solitary test with water extinguishment was repeated for an assessment of variability. HCN and acid gases were not present in significant concentrations. The principal components that contributed appreciably to short-term occupational exposure hazards were formaldehyde, acrolein, benzene, polyaromatic hydrocarbons, and carbon monoxide. When a flocculation effect that cleared air particulate occurred during the use of the protein-based water additive, air concentrations of most chemicals in the air samples were reduced.     

带压缩空气储能的冷热电联产系统的

对一种带压缩空气储能的冷热电联产系统进行了热力学(火用)分析,得到了各主要部件和整个系统的(火用)损失及(火用)效率的变化规律.分析结果表明空气透平绝热效率的提高对系统(火用)效率的贡献大于压缩机效率同样提高的功效;在其它参数确定时,存在最佳压比,可使系统的(火用)效率在该条件下达极值;高温换热器是新型冷热电联产系统中产生(火用)损失的主要部件,而循环水量的大小是影响高温换热器(火用)效率的主要因素.     

矿用风动水泵调速盘的数控加工

Pro/E中的NC模块是一种基于参数化特征造型技术的编程工具。利用该模块实现了矿用风动水泵调速盘的自 动数控编程,并能对其加工过程进行仿真。     

Health Effects of Working in Compressed Air

For more than 50 years, civil engineers, scientists and the medical profession have collaborated to reduce the occupational health risks of working in compressed air. Under the auspices of the Medical Research Council, the Health and Safety Executive and, through the Construction Industry Research and Information Association (CIRIA) of the civil-engineering industry, the data of the Decompression Sickness Central Registry of exposure and medical records are being analysed in order to identify healthier working practices and disciplines.