Spray Break-Up Process of Diesel Fuel Investigated Close to the Nozzle

A. Fath; K.-U. Munch; Alfred Leipertz

doi:10.1615/interjfluidmechres.v24.i1-3.250

Spray Break-Up Process of Diesel Fuel Investigated Close to the Nozzle

International Journal of Fluid Mechanics Research ◽

10.1615/interjfluidmechres.v24.i1-3.250 ◽

1997 ◽

Vol 24 (1-3) ◽

pp. 251-260 ◽

Cited By ~ 5

Author(s):

A. Fath ◽

K.-U. Munch ◽

Alfred Leipertz

Keyword(s):

Diesel Fuel ◽

Break Up

Download Full-text

Coal-Water Slurry Spray Characteristics of a Positive Displacement Fuel Injection System

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.2906621 ◽

1992 ◽

Vol 114 (3) ◽

pp. 528-533 ◽

Cited By ~ 7

Author(s):

A. K. Seshadri ◽

J. A. Caton ◽

K. D. Kihm

Keyword(s):

Diesel Fuel ◽

Fuel Injection ◽

Cone Angle ◽

Operating Conditions ◽

Injection System ◽

Fuel Injection System ◽

Water Slurry ◽

Positive Displacement ◽

Coal Water Slurry ◽

Break Up

Experiments have been completed to characterize coal-water slurry sprays from a modified positive displacement fuel injection system of a diesel engine. The injection system includes an injection jerk pump driven by an electric motor, a specially designed diaphragm to separate the abrasive coal from the pump, and a single-hole fuel nozzle. The sprays were injected into a pressurized chamber equipped with windows. High speed movies and instantaneous fuel line pressures were obtained. For injection pressures of order 30 MPa or higher, the sprays were similar for coal-water slurry, diesel fuel, and water. The time until the center core of the spray broke up (break-up time) was determined both from the movies and from a model using the fuel line pressures. Results from these two independent procedures were in good agreement. For the base conditions, the break-up time was 0.58 and 0.50 ms for coal-water slurry and diesel fuel, respectively. The break-up times increased with increasing nozzle orifice size and with decreasing chamber density. The break-up time was not a function of coal loading for coal loadings up to 53 percent. Cone angles of the sprays were dependent on the operating conditions and fluid, as well as on the time and location of the measurement. For one set of cases studied, the time-averaged cone angle was 15.9 and 16.3 deg for coal-water slurry and diesel fuel, respectively.

Download Full-text

Simulasi Numerik II : Distribusi Diameter Droplet pada Semprotan Biodiesel Kelapa, Jatropa Curcas dan Minyak Goreng Bekas dalam Ruang Bakar Mexican Hat

Machine Jurnal Teknik Mesin ◽

10.33019/jm.v6i2.1381 ◽

2020 ◽

Vol 6 (2) ◽

pp. 18-23

Author(s):

I Gede Teddy Prananda Surya

Keyword(s):

Diesel Fuel ◽

Large Scale ◽

Direct Injection ◽

Mexican Hat ◽

Break Up ◽

Diameter Droplet

Abstrak Biodiesel merupakan bahan bakar terbarukan dengan properties hampir menyerupai diesel fuel dan dapat digunakan pada motor diesel direct injection tanpa perubahan sistem bahan bakarnya. Bahan baku biodiesel yang tersedia di Indonesia antara lain kelapa, jatropa curcas dan minyak goreng bekas dapat diubah menjadi biodiesel melalui proses esterifikasi. Penelitian numerik menggunakan FLUENT 6.2 ini dilakukan pada model ruang bakar mexican hat untuk mengetahui distribusi ukuran droplet serta visualisasi semprotan dari ketiga jenis biodiesel tersebut. Pemodelan turbulen yang digunakan adalah RNG k-ε karena dapat memprediksi struktur large scale yang diproduksi oleh semprotan dan squish flow sedangkan pemodelan break-up menggunakan WAVE karena semprotan ini berlangsung dalam angka Weber yang tinggi. Hasil numerik membuktikan bahwa biodiesel minyak goreng bekas memiliki droplet berdiameter lebih besar daripada biodiesel kelapa atau jatropa curcas karena memiliki tegangan permukaan tinggi. Diameter partikel akan berkurang saat penetrasi semakin jauh karena pengaruh gaya aerodinamik yang bekerja pada droplet dan droplet tadi pecah setelah bertumbukan dengan dinding piston. Kata kunci : diameter droplet, SMD, biodiesel

Download Full-text