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791.
低温等离子体汽油重整对稀燃极限影响的实验 总被引:1,自引:0,他引:1
为提高稀薄燃烧汽油机的稀燃极限,提出了一种借助低温等离子体,利用稀薄燃烧发动机排气中的氧气和水蒸气对燃油进行重整,以制得富氢的混合气体辅助发动机进行稀薄燃烧的方法.设计了一套等离子体排气重整系统,并对其进行了排气重整性能的研究.在一台稀燃发动机上进行了低温等离子体燃油重整对稀薄燃烧极限影响的实验,实验结果表明:利用等离子体排气重整系统,能够进一步扩大发动机的稀燃极限;重整比例每增大10%,发动机燃烧极限增大约1~2个空燃比单位. 相似文献
792.
In this work, we investigate the combustion of hydrogen fuel through the wind tunnel tests. Two kinds of fuel, the pure hydrogen
and the hydrogen-ethene mixture, have been chosen to heat the oxygen-enriched air. It is found that the stable pressure in
the engine combustor and the thrusts is almost the same in two cases. A valuable feature we revealed is that the heating pattern
of hydrogen and ethene mixture leads to a considerable delay of the establishment of the wall pressure in the combustor, compared
with the pure hydrogen case. This phenomenon implies a longer ignition delay time for the mixture case. The shorter ignition
delay resulting from the hydrogen heater is attributed to the continuity of chain propagation and the exclusion of the less
active C-containing radicals. 相似文献
793.
边界参数对HCCI发动机燃烧影响的模拟研究 总被引:1,自引:1,他引:0
为了研究边界参数对柴油均质压燃(HCCI)发动机燃烧过程的影响,应用CHEMKIN化学动力学软件包中的SENKIN程序以及正庚烷(n-heptane)氧化反应简化模型,模拟了不同进气温度、进气压力和当量比等边界参数对HCCI发动机燃烧及排放特性的影响.结果表明,在相同当量比条件下,增压可以拓宽HCCI发动机负荷工况范围,同时保持氮氧化物排放基本不变;过浓或过稀的混合气导致CO排放增加;混合气浓度分层增加NO排放. 相似文献
794.
针对相位编码信号的高旁瓣问题,提出一种基于二阶锥规化的峰值旁瓣抑制滤波器设计方法。将最大增益处理损失约束下的最小峰值旁瓣滤波器设计转化为二阶锥规化问题,采用内点法进行高效求解。与已有方法相比,所提方法可以兼顾峰值旁瓣、处理增益损失和滤波器长度三方面的指标,具有设计灵活、精度高和收敛性好的优点。最后仿真和实测数据结果验证了方法的有效性。 相似文献
795.
Ignition of methane/air mixture by the passage of a shock wave is an important issue for understanding more details of its gaseous detonation. The experiments of shock-induced ignition of stoichiometric methane/air mixture were conducted on a shock tube platform, The reaction zone structure in weak and strong ignition cases were investigated by digital chemiluminescence imaging and planar laser induced fluorescence (PLIF) techniques. Due to smaller gradients in induced time in weak ignition, which provided more time to nonlinear chemical reaction process, the results show that the reaction structures are highly nonuniform in those weak ignition cases, which become more regular while induced shock waves become stronger. In strong ignition case, it gives a typical detonation structure. The characteristics of reaction zone released by single-pulsed OH PLIF technique agreed well with other experimental measurements in this paper and were also in accord with the conclusions of previous researches. The successful implementation of the PLIF system has explored a new high temporally and spatially resolved method for the study of interaction between shock wave and gaseous matter in shock tube. 相似文献
796.
The startup process of a thermoacoustic engine is a self-excited oscillation process generated in inhomogeneous acoustic media.
To reveal these coupling relations between various influential factors is an important task of basic research on thermoacoustics.
In this paper thermoacoustic engines are regarded as thermoacoustic oscillators consisting of the active network and the passive
network. Accordingly, the two-port Y-parameter for relevant component is derived, and standing wave and traveling wave thermoacoustic engine are described by
the negative-resistance and feedback model, respectively. The relevant two-port network topology is given as well. The startup
criteria for thermoacoustic oscillators are obtained by using Nyquist instability criterion. The model prediction of startup
parameters, particularly, startup frequency and mode characteristic are in agreement with that of experimental results reported
in the literature. Moreover, with topological graphs it is verified that standing wave engines would start up in a negative-resistance
state and there would exist high frequency modes in thermoacoustic-Stirling engines. By investigating into the frequency response
of thermoacoustic system, this method proposed can achieve such an objective that these effects of operating and structural
parameters of engine on startup modes and startup temperature can be revealed in an analytical way. Thus this approach to
test and check thermal stability can be provided in a design phase, instead of using empirical frequency to design thermoacoustic
systems.
Electronic Supplementary Material Supplementary material is available for this article at and is accessible for authorized users.
Supported by National Natural Science Foundation of China (Grant Nos. 50576024 and 51076013) 相似文献
797.
提出一种用于哼唱识别精确匹配的线性伸缩动态规划算法。该算法将哼唱旋律切割成句子,对每一句子进行线性伸缩匹配,同时在句子层次进行动态规划获得最优路径。该算法更有效地利用了哼唱语音的分段特性并克服了动态规划在长路径搜索时可能丢失全局最优路径的缺点。在含5 223首M ID I的数据库上同等条件下该算法正确率分别比线性伸缩、动态规划及递归匹配方法提高10.5%、6.0%和2.8%。该算法具有更高的准确率和更小的时间复杂度,是一种更有效的精确匹配算法。 相似文献
798.
799.
提出一种新的低比特率图像压缩算法,该算法首先利用SUSAN算子检测出输入图像的边缘信息,然后利用边缘增强方法对边缘信息进行增强,最后将增强后的边缘信息和解码后的输入图像相加形成最终的压缩图像.实验结果表明,和基于小波的传统编码方法相比,在低比特率下,该算法能减少图像的边缘模糊,提高压缩图像的识别度和峰值信噪比. 相似文献
800.
李秀坤 《南京邮电大学学报(自然科学版)》2009,9(20)
红外图像数据传输时,由于数据量大,需压缩后传输,而压缩后数据对信道干扰非常敏感,需进行信道纠错编码以保障数据传输,提高抗干扰性。本文介绍了一种信源信道联合编码策略,即信源采用多分辨率重采样图像压缩算法,信道采用RS码加交织,解决了图像传输过程中的信道干扰问题。 相似文献