VISUALIZATION AND MEASUREMENTS OF TURBULENT FLAME PROPAGATION IN A CONSTANT VOLUME CHAMBER

恒容室中湍流火焰传播的可视化和测量

• 批准号: 08650236
• 负责人: OHYAGI Shigeharu
• 金额: $ 1.47万
• 依托单位: SAITAMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650236/
• 关键词: Combustion; Premixed Flame; Propagating Flame; Schlieren Method; Turbulent Flame; Lean Burn; 定容容器; 乱流燃焼; 燃焼機構; 可視化; 火炎伝播; 燃焼学; 数値シミュレーション

In the spark-ignition engines, mixtures introduced in the combustion chamber are ignited and a flame propagates to convert the mixtures to a burned gas. For improving the thermal efficiency of the engines, time consumed by this process should be reduced. This research aims at the understanding of the mechanism of turbulent flame propagation in a constant volume chamber. The research consists of two types of experiments, one is for the flame propagation in a swirling flow and the other is for that in a nearly homogeneous isotropic turbulence. In the former experiment, a premixed gas is introduced in the chamber tangentially along its side wall. The strength of this swirling flow decays with time. The mixture is ignited at an appropriate time after the mixture starts to be introduced. When this time is short, so that the strength of the swirl is strong, a burning time is very short while the time is long, the burning time becomes long. It is concluded that the burning time is well correlated to the swirling velocity of the unburned gas flow. On the other hand, in the second experiment, the mixture is introduced radially from eight ports on the side wall. So, thereis no main flow such as a swirl. Turbulence intensity of the mixture was measured by a hot wire anemonater and it decays with a time after the mixture is introduced. Varyng the time of ignition, the burning time was measured for different turbulent intensities. It is elucidated that the burning time is a particuler function of the turbulence inetnsity.

在火花点火发动机中，引入燃烧室中的混合物被点燃，并且火焰传播以将混合物转化为燃烧气体。为了提高发动机的热效率，应该减少这个过程所消耗的时间。本研究旨在了解湍流火焰在定容燃烧室内的传播机理。研究包括两种类型的实验，一种是在旋转流中的火焰传播，另一种是在近均匀各向同性湍流中的火焰传播。在前一个实验中，预混气体被引入到腔室切向沿着其侧壁。这种旋流的强度随时间衰减。在开始引入混合物之后的适当时间点燃混合物。当该时间短时，使得涡流的强度强，燃烧时间非常短，而时间长时，燃烧时间变长。结果表明，燃烧时间与未燃气流的旋流速度有很好的相关性。另一方面，在第二实验中，混合物从侧壁上的八个端口径向引入。因此，没有像漩涡那样的主流。用热线风速仪测量了混合物的湍流强度，并在引入混合物后随时间衰减。通过改变点火时间，测量了不同湍流强度下的燃烧时间。阐明了燃烧时间是湍流强度的特殊函数。

项目成果

小原哲郎、蔡品、吉橋照夫、大八木重治: "定容容器内乱流火炎の研究" 日本燃焼学会第35回燃焼シンポジウム講演論文集. 151-153 (1997)

Tetsuro Ohara、Pinin Cai、Teruo Yoshihashi、Shigeharu Oyagi：“定容容器中湍流火焰的研究”日本燃烧学会第 35 届燃烧研讨会论文集 151-153 (1997)。

OBARA,T., CAI,P., YOSHIHASHI,T., OHYAGI,S.: "A Research of Turbulent Flame Propagation in a Constant Volume Chamber" Proceedings of the 35th Japanese Symposium on Combustion. 151-153 (1997)

OBARA,T.、CAI,P.、YOSHIHASHI,T.、OHYAGI,S.：“定容室中湍流火焰传播的研究”第 35 届日本燃烧研讨会论文集。

小倉 孝史、渡辺 和憲、吉橋 照夫、蔡品、小原 哲郎、大八木 重治: "定容容器内伝ぱ火炎に及ぼす気流乱れの影響" 日本機械学会関東支部ブロック合同講演会講演論文集. 158-159 (1997)

Takashi Ogura、Kazunori Watanabe、Teruo Yoshihashi、Xin Cai、Tetsuro Ohara、Shigeharu Oyagi：“空气湍流对定容容器中火焰传播的影响”日本机械工程学会关东分会联合讲座论文集158-159（ 1997))

小倉孝史、渡辺和憲、吉橋照夫、蔡品、小原哲郎、大八木重治: "定容容器内伝ぱ火炎に及ぼす気流乱れの影響" 日本機械学会関東支部ブロック合同講演会講演論文集. 158-159 (1997)

Takashi Ogura、Kazunori Watanabe、Teruo Yoshihashi、Hina Cai、Tetsuro Ohara、Shigeharu Oyagi：“空气湍流对固定容积容器中火焰传播的影响”日本机械工程师学会关东分会联合讲座论文集158。 -159 (1997))

小原 哲郎、蔡品、吉橋 照夫、大八木 重治: "定容容器内乱流火炎の研究" 日本燃焼学会第35回燃焼シンポジウム講演論文集. 151-153 (1997)

Tetsuro Ohara、Pinin Cai、Teruo Yoshihashi、Shigeharu Oyagi：“定容容器中湍流火焰的研究”日本燃烧学会第 35 届燃烧研讨会论文集 151-153 (1997)。