Measurement and Analysis of Underhood Ventilation Air Flow and Temperatures for an Off-Road Machine

Sofu, Tanju; Chang, F. C.; Dupree, Ron; Malipeddi, S.; Uppuluri, Sudhindra; Shapiro, Steven

doi:10.1007/978-3-540-44419-0_34

Cited by 2 publications

(3 citation statements)

References 1 publication

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“…Some studies have analyzed different fan installation positions and cooling packages in an agricultural tractor, with a three-dimensional numerical approach [12,13]. A similar approach, coupled with one-dimensional thermal fluid model, was also used to assess the cooling requirements of an off-road equipment using experimental data [14].…”

Section: Introductionmentioning

confidence: 99%

CFD Methodology for an Underhood Analysis towards the Optimum Fan Position in a Compact Off-Road Machine

2023

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A compact off-road machine tends to have a compact engine structure, which may result in small clearances between the main engine, the cooling system, and the radiator. In the design of its cooling system, the heat exchanger, fan, and conveyor are normally chosen based on their fixed operating point. Unfortunately, these machines work in variable conditions and the performance of each component is different when they are working as a whole under the hood. The aim of this work is to optimize the position of these components through a parametric analysis of some variables, using the Computational Fluid Dynamics technique. The air flows are analyzed in order to show the pressure waves created by the air moved by the fan blades, showing how the fluid interacts with the engine. The results show that optimizing this installation can increase the efficiency of the fan by 10% and reduce the noise emitted by 13 dB. These results should sensitize designers to use CFD analyses, not for a single component, but for the entire system. The methodology shown can be applied for the better design of cooling systems, mainly in off-road vehicles that have noise emission problems.

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Section: Introductionmentioning

confidence: 99%

CFD Methodology for an Underhood Analysis towards the Optimum Fan Position in a Compact Off-Road Machine

2023

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“…The geometrical constraints associated with the overall vehicle design affect the layout of the engine components in the underhood compartment. For heavy duty vehicles, the underhood cooling becomes more challenging issue compared to the passenger vehicles as a result of the operating conditions including, lack of ram air rate due to low vehicle speed, higher operating temperatures, payload capacity, and the dirty environment (Sofu et al, 2004). Proper modeling of aforementioned issues under the geometric constraints with proper assumptions appears as a challenging task for the analysis of underhood flow phenomena.…”

Section: Introductionmentioning

confidence: 99%

“…Davis, Veling, Caltrider, and Madhavar (1993) performed three dimensional CFD simulations on the cooling system of light trucks; in addition they discussed the necessity for an underhood thermal management model. Sofu et al (2004) employed three dimensional CFD simulations coupled with one-dimensional thermal-fluid model in order to assess cooling requirement of an off-road construction equipment using the experimental data. Tai, Cheng, and Liao (2007) performed practical and simplified modeling of vehicle front part based on finite volume methods.…”

Section: Introductionmentioning

confidence: 99%

Effect of fan and shroud configurations on underhood flow characteristics of an agricultural tractor

Ozturk

Çetin

Yavuz

2019

Engineering Applications of Computational Fluid Mechanics

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In the current study, effects of two different underhood geometry modifications namely; fan position relative to shroud and fan tip clearance, on airflow through an agricultural tractor engine cooling system are investigated by utilizing CFD modeling. For the characterization of each modification, the underhood components are reduced to a domain of cooling systems including only fan, shroud, and radiator that allows saving in computational time and cost. The models are validated using a custom designed underhood flow setup, where hotwire velocity measurements at proximity to the radiator are conducted. The mass flow rate and the uniformity of the airflow through the radiator are quantified as performance parameters. For the former modification, position of fan relative to shroud, the computations are performed for the percentages of fan projection into shroud (FPiS) varying from 78% to 0% at fan rotational speeds of 2060 and 2800 rpm. The optimum fan location is found to be around 56-60% for both rotational speeds that leads 8% increase in mass flow rate compared with the pre-design location of 74%. In addition, a noticeable reduction in the relative magnitude of the RMS velocity through the radiator is obtained for the moderate FPiS values. For the latter modification, fan tip clearance, the computations are performed for the tip clearance values varying from 5.25to 12 mm at a fan rotational speed of 2060 rpm. As the tip clearance decreases up to 6 mm, air mass flow rate can be improved by 7%. However, further reduction in tip clearance does not improve the air mass flow rate instead it decreases, suggesting an optimum tip clearance value. The results suggest that the proper geometrical modifications in engine cooling systems might induce significant improvement in the aforementioned performance indicators.

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Measurement and Analysis of Underhood Ventilation Air Flow and Temperatures for an Off-Road Machine

Cited by 2 publications

References 1 publication

CFD Methodology for an Underhood Analysis towards the Optimum Fan Position in a Compact Off-Road Machine

CFD Methodology for an Underhood Analysis towards the Optimum Fan Position in a Compact Off-Road Machine

Effect of fan and shroud configurations on underhood flow characteristics of an agricultural tractor

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