共查询到20条相似文献，搜索用时 203 毫秒
1.
《浙江大学学报(A卷英文版)》2017,(2)
目的:通过发动机直连式实验,验证燃气发生器产生的富燃燃气可以在超声速气流中二次燃烧,进而证明固体火箭超燃冲压发动机方案的可行性,并初步评估固体火箭超燃冲压发动机燃烧室的工作性能。创新点:1.提出固体火箭超燃冲压发动机构型方案,并开展固体火箭超燃冲压发动机燃烧室直连式实验研究;2.验证了固体火箭超燃冲压发动机构型可行;3.初步评估了固体火箭超燃冲压发动机燃烧室的工作性能。方法:1.通过直连式实验测定固体火箭超燃冲压发动机燃烧室的工作参数(图2、3和4);2.通过实验现象(图8)和数据处理,确定燃气发生器产生的富燃燃气可以在超声速燃烧室中燃烧,进而确定固体火箭超燃冲压发动机方案的可行性;3.初步确定发动机燃烧室的工作性能(公式(6)和(7))。结论:1.燃气发生器中产生的富燃燃气可以在超声速燃烧室中燃烧,固体火箭超燃冲压发动机构型方案可行;2.初步评估了固体火箭超燃冲压发动机燃烧室的工作性能,总压恢复系数约为0.6,燃烧效率约为90%;3.燃气发生器产生的部分一次燃气沉积于燃气发生器喉部,使燃气发生器的工作压力增加,进而引起富燃燃气质量流量的增加;4.燃烧室中的总压损失主要集中在富燃燃气入口处,总压损失主要由射流引起的激波和燃气二次燃烧引起。 相似文献
2.
《实验室研究与探索》2008,(3)
青岛科技大学开设“实验室管理”选修课已坚持20年,效果较好。现发表对该校马连湘校长的访谈录,供借鉴参考。海军航空工程学院刘海峰对固体发动机进行实验测定和理论计算,两者附合性较好。证明作者的实测方法可用于实际固体发动机。延边大学朴相范等的文章介绍了改革传统的 相似文献
3.
4.
针对船舶装载对初稳度的影响问题,运用船舶横摇周期与稳性关系原理,设计并制作了实验教学模型,并对实验模型参数进行了计算。围绕移动固体载荷对船舶稳性影响,装卸固体载荷对船舶稳性影响,装卸相同质量的固体载荷和液体对船舶稳性影响之比较,以及装载相同质量的液体载荷时,自由液面面积不同对船舶稳性影响之比较等问题,开展了模型理论计算分析和实验验证。结果表明,该装置能够满足学生完成船舶装载对初稳度影响的实验验证要求,误差控制在10%左右,具有适用性强,效果清晰的特点。 相似文献
5.
中国航天科工集团第六研究院 《中国职工教育》2009,(2)
中国航天科工集团第六研究院是我国最早成立的固体火箭发动机研制单位,1962年成立于四川泸州,1965年搬迁至内蒙古呼和浩特市,有员工5000余人。40多年来,共研制出70多种型号的固体火箭发动机,成功应用于国防和航天领域,获得国家级和部委级科技成果奖400余项,是中国航天领域惟一“优质固体火箭发动机”金牌单位, 相似文献
6.
郁章玉 《临沂师范学院学报》1992,(Z1)
电化学是能量产生、贮存和转换的重要基础科学.如太阳能转换、燃料电池的制备、电池的电能贮存等能量研究都需要电化学作为重要的基础和方法.本文将系统介绍有关内容. 1 光电化学电池固体光电池虽已付之应用,但制造成本较高.近年来,液体光电化学电池引起了人们 相似文献
7.
8.
理论分析发动机转矩波动产生机理,通过有限元分析得到离散化曲轴模型,建立了滑动轴承动态接触数学模型;协同各子部件间动力学关系,考虑燃气压力、变惯性力等激励载荷,在ADAMS中建立发动机曲轴连杆机构多体动力学模型,仿真计算发动机不同稳态工况下动态转矩,研究曲轴弹性、滑动轴承弹性支承、输出转速等对发动机输出动态转矩的影响。通过试验对比和简谐分析,表明了仿真方法的可行性和准确性,为车辆动力传动系统的扭振分析提供激励条件。 相似文献
9.
气球在化学实验中具有多种应用,如收集尾气、贮存气体、盛放固体或气体反应物等。下面介绍两类比较典型的应用。 相似文献
10.
气球在化学实验中具有多种应用,如收集尾气、贮存气体、盛放固体或气体反应物等.下面介绍两类比较典型的应用.
1尾气的收集处理
实验中不能被固体或液体物质吸收而又有毒不能排放空气中的尾气,如CO、NO等.其最简便有效的处理方法就是用气球来收集. 相似文献
11.
汽车发动机性能仿真模型研究 总被引：1，自引：0，他引：1
将发动机速度、负荷和万有特性离散化为矩阵形式,采用曲线、曲面拟合、神经网络方法进行数学建模,建立了汽车发动机仿真数学模型,开发了计算仿真程序。对发动机外特性进行拟合,拟合阶次越高,结果越精确,采取5阶拟合即可以真实反映发动机的外特性;对发动机万有特性与负荷特性进行拟合,拟合度为99．85％,可见试验数据模型化后的结果是可以接受的．,建立数学模型具有很高的模拟精度,能精确地反映出发动机的特性。 相似文献
12.
Effects of exhaust gas recirculation （ EGR） on homogeneous charge combustion of n-heptane was studied through simulation and experiment. Experiments were carried out in a single cylinder, four-stroke, air cooled engine and a single cylinder, two-stroke, water cooled engine. In the four-stroke engine, experiments of the effects of EGR were examined using heated N2 addition as a surrogate for external EGR and modifying engine to increase internal EGR. The ignition timing was sensitive to EGR due to thermal and chemical effects. EGR or extra air is a key factor in eliminating knock during mid-load conditions. For higher load operation the only way to avoid knock is to control reaction timing through the use of spark ignition. Experimental and modeling results from the twostroke engine show that auto-ignition can be avoided by increasing the engine speed. The twostroke engine experiments indicate that high levels of internal EGR can enable spark ignition at lean conditions. At higher load conditions, increasing the engine speed is an effective method to control transition from homogeneous charge compression ignition （ HCCI） operation to non-HCCI operation and successful spark ignition of a highly dilute mixture can avoid serious knock. 相似文献
13.
Chandrahas M. Halai 《Resonance》2011,16(1):65-68
The most common answer to the above question is — hot jet of gas comes out of the nozzle of the rocket engine at high speeds and as a reaction the rocket moves (is propelled) in the opposite direction [1]. But is this answer right? Let us explore what goes on inside a rocket engine and arrive at the right answer. 相似文献
14.
赖学江黄森炜廖洪毅曹智校陈清云 《福建工程学院学报》2021,(4):372-377
以深圳某办公楼为例,探讨冰蓄冷空调系统运行策略的优化。采用鸿业全年负荷计算及能耗分析软件(HY-EP)进行全年动态负荷模拟,对冷负荷的负荷率进行分析。在选定冰蓄冷系统后,基于模拟结果和地区的峰谷平电价的特点,采用了基于全年动态负荷结果分析预测和结合前一天的负荷作为当日的负荷预测,将全年逐日运行策略简化为4 种设备的运行方案,控制较为容易实现,且需要增加的初投资较少,是结合冰蓄冷系统与全年动态负荷模拟技术的创新应用。 相似文献
15.
An acoustic pressure amplifier （APA） is capable of improving the match between a thermoacoustic engine and a load by elevating pressure ratio and acoustic power output. A standing-wave thermoacoustic engine driving a resistance- and-compliance （RC） load through an APA was simulated with linear thermoacoustics to study the impact of load impedance on the performance of the thermoacoustic system. Based on the simulation results, analysis focuses on the distribution of pressure amplitude and velocity amplitude in APA with an RC load of diverse acoustic resistances and compliance impedances. Variation of operating parameters, including pressure ratio, acoustic power, hot end temperature of stack, etc., versus impedance of the RC load is presented and analyzed according to the abovementioned distribution. A verifying experiment has been performed, which indicates that the simulation can roughly predict the system operation in the fundamental-frequency mode. 相似文献
16.
针对火箭发动机原理课程实验教学探讨了仿真实验实践教学模式,研制了火箭发动机工作过程仿真实验系统,经过几届学员的试用取得了良好的教学效果. 相似文献
17.
刘玉娟 《中国现代教育装备》2010,(5):62-64
单相可控整流电路中应用最多的是单相桥式全控整流电路。本文使用MATLAB软件对带电阻负载和带阻感负载的单相桥式全控整流电路进行了仿真分析。实例证明,仿真的结果与理论分析结果基本一致。实践表明,在教学中将MATLAB仿真分析与理论教学相结合,有利于提高学生的动手能力,也有利于学生对理论知识的理解和掌握。 相似文献
18.
Jun-yi LIANG Jian-long ZHANG Xi ZHANG Shi-fei YUAN Cheng-liang YIN 《浙江大学学报(A卷英文版)》2013,14(8):535-553
To solve the low power density issue of hybrid electric vehicular batteries, a combination of batteries and ultra- capacitors （UCs） could be a solution. The high power density feature of UCs can improve the performance of battery/UC hybrid energy storage systems （HESSs）. This paper presents a parallel hybrid electric vehicle （HEV） equipped with an internal combus- tion engine and an HESS. An advanced energy management strategy （EMS）, mainly based on fuzzy logic, is proposed to improve the fuel economy of the HEV and the endurance of the HESS. The EMS is capable of determining the ideal distribution of output power among the internal combustion engine, battery, and UC according to the propelling power or regenerative braking power of the vehicle. To validate the effectiveness of the EMS, numerical simulation and experimental validations are carried out. The results indicate that EMS can effectively control the power sources to work within their respective efficient areas. The battery load can be mitigated and prolonged battery life can be expected. The electrical energy consumption in the HESS is reduced by 3.91% compared with that in the battery only system. Fuel consumption of the HEV is reduced by 24.3% compared with that of the same class conventional vehicles under Economic Commission of Europe driving cycle. 相似文献
19.
Liquid or gaseous fuel scramjet technology has made great progress, and there has been some research attention to solid-fuel scramjet. A new scramjet configuration using solid fuel as propellant, namely solid-fuel rocket scramjet, is tested experimentally. It consists of two combustors. One is a rocket combustor used as gas generator, and the other is a supersonic combustor used for secondary combustion. The experiment simulates a flight Mach number of 4 at high altitude (stagnation temperature and pressure are 1170 K and 1.16 MPa, respectively), and metalized solid fuel is used as propellant. The results reveal that fuel-rich gas from the gas generator can burn with air in the supersonic combustor. Preliminary evaluation results show that the combustion efficiency of the propellant is about 90%, and the total pressure recovery coefficient in the supersonic combustor is about 0.6. These results indicate that the configuration of solid-fuel rocket scramjet is feasible. 相似文献