日本財団 図書館

共通ヘッダを読みとばす


Top > 産業 > 運輸.交通 > 成果物情報

論文集 ISME TOKYO 2000 Volume?

 事業名 第6回舶用機関国際シンポジウムの開催
 団体名 日本マリンエンジニアリング学会  


TS-8

 

Analysis of Nozzle Orifice Size Effect on Smoke in a Diesel Engine

 

Masahiro ISHIDA*, Daisaku SAKAGUCHI* and Hironobu UEKI*

 

ABSTRACT

The effect of nozzle orifice size on smoke emission was examined experimentally in a turbocharged DI diesel engine, and was analyzed theoretically by using the two-zone model. The nozzle orifice size was varied from 0.26 to 0.18 mm under various engine operation condition. The rates of NO-formation, soot-formation and soot-oxidation were analyzed based on the measured combustion pressure time history, the measured exhaust NOx concentration and the measured exhaust smoke. As results, the changes due to orifice size in the excess air ratio of the burned zone, the soot particle size and the number of soot particles were estimated. It is shown that the soot size is primarily dependent on the orifice size and secondarily but more markedly on the spray penetration for the ignition delay period, and the number of soot particles is primarily dependent on the amount of fuel injected and secondarily on the excess air ratio of the burned zone.

 

Key Words: Diesel Engine, Combustion, Smoke, Nozzle Orifice Size, Two-Zone Model, Soot Particle Size

 

NOMENCLATURE

 

166-1.gif

 

1. INTRODUCTION

 

To meet increasingly stringent emission standards in marine diesel engines as well as automotive small diesel engines, extensive research has been carried out to explore various ways to reduce NOx and particulate emissions from diesel engines. In various methods for reducing NOx and/or particulate, the utilization of water such as water-emulsified fuel (Tsukahara, et al. [1]), port water injection (Ishida, et al. [2]), stratified water-fuel injection (Takasaki, et al. [3]), and exhaust-water-selective recirculation (Fukuda, et al. [4]) has been reexamined, and a marked effect of water was shown especially on reduction in NOx. On the other hand, smoke can be reduced, as is well known, by an increase in fuel injection pressure as well as a decrease in nozzle orifice size because the fuel droplet size is reduced significantly [5]. One of the most popular semi-empirical models of soot formation in a Diesel engine suggested by Hiroyasu & Kadota[6] includes only two steps; (1) soot formation linked directly to the concentration of initial fuel; and (2) soot oxidation related to the concentration of molecular oxygen. This model and its modifications were successfully applied in a number of studies. However, It was also shown that two-step models have rather limited range of applicability. In addition, these models do not provide the information regarding the size of soot particles. Therefore, multistep phenomenological model of soot formation and oxidation was currently proposed by Kazakov & Foster [7], which could predict reasonably well the in-cylinder soot concentration, particle number density and partical size. However, the information with respect to the size of soot particle is still one of the issues of practical interest.

The objective of this study is to clarify semi-empirically physical factors which affect the size of soot particle and the number of soot particle in diesel engines, The amount of fuel injected, nozzle orifice size, ignition delay, fuel spray penetration, the excess air ratio of the burned zone as well as the fuel injection pressure are taken into consideration as the factors in the present analysis. The experimental work was conducted in a turbocharged DI diesel engine in which the nozzle orifice size was varied from 0.26 to 0.18 mm every 0.02 mm under various engine operation conditions.

 

* Nagasaki University

1-14 Bunkyo-Machi, Nagasaki 852-8521, JAPAN

FAX: +81-95-847-3247, E-mail: hiro@net.nafasaki-u.ac.jp

 

 

 

BACK   CONTENTS   NEXT

 






サイトに関するご意見・ご質問・お問合せ   サイトマップ   個人情報保護

日本財団会長笹川陽平ブログはこちら



ランキング
注目度とは?
成果物アクセスランキング
581位
(31,386成果物中)

成果物アクセス数
16,893

集計期間:成果物公開〜現在
更新日: 2019年7月20日

関連する他の成果物

1.プログラム ISME TOKYO 2000
2.論文集 ISME TOKYO 2000 Volume?
3.ISME TOKYO 2000追加論文 ADVANCES IN MARINE ENGINE LUBRICATION
4.ISME TOKYO 2000 追加論文 FT8 Phase ? Reliability Improvement Program
5.PROCEEDINGS OF ISME TOKYO 2000 SPECIAL LECTURE
6.参加者名簿
7.展示用DIRECTORY
8.学会誌Vol.36 No.2
9.中高齢者の災害防止のためにイラスト入り中高齢者災害事例と安全対策墜落・転落編
  [ 同じカテゴリの成果物 ]


アンケートにご協力
御願いします

この成果物は
お役に立ちましたか?


とても役に立った
まあまあ
普通
いまいち
全く役に立たなかった


この成果物をどのような
目的でご覧になりましたか?


レポート等の作成の
参考資料として
研究の一助として
関係者として参照した
興味があったので
間違って辿り着いただけ


ご意見・ご感想

ここで入力されたご質問・資料請求には、ご回答できません。






その他・お問い合わせ
ご質問は こちら から