![]() However, further reduction in tip clearance does not improve the air mass flow rate instead it decreases, suggesting an optimum tip clearance value. As the tip clearance decreases up to 6 mm, air mass flow rate can be improved by 7%. 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. In addition, a noticeable reduction in the relative magnitude of the RMS velocity through the radiator is obtained for the moderate FPiS values. 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%. 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 20 rpm. The mass flow rate and the uniformity of the airflow through the radiator are quantified as performance parameters. The models are validated using a custom designed underhood flow setup, where hotwire velocity measurements at proximity to the radiator are conducted. 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. 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. ![]() Flow field measurements show that the fan with the shroud has a larger exit radial component of the velocity than the fan without the shroud except at low system flowrates, and the vorticity and the turbulence intensity of the fan with the shroud are lower than those of the fan without the shroud. The results of the performance experiment demonstrate that the fan with the shroud covering only the front part of the rotor possesses the highest performance, and the performance of the fan without the shroud seems to be less affected by the system flowrate. ![]() Moreover, a comparison of the flow field behind the fan with the shroud and that behind the fan without the shroud is made. You can expect a refund, in the same form of payment originally used for purchase, within seven to fourteen days of our receiving your return.The effect of the shroud position on the performance of an automotive cooling fan with the radiator mounted at the front end has been studied on a test platform, and the characteristics of the flow field and phase-averaged velocity, vorticity, and turbulence intensity in five phases behind the cooling fan have been acquired by using digital particle image velocimetry. We'll notify you via e-mail of your refund once we have received and processed the returned item. To return an item, please call us at 1-866-944-STUF (1-86) or you can Click Here to contact us using our online contact form. Otherwise, you will receive a full refund for the cost of the item, but the original and return shipping fee will not be refunded. Please note that we can refund shipping fees only if the return is a result of our error. 944online return policy does not apply to competition or off road use. 944online does not guarantee products that become defective due to improper installation or improper use. ĩ44online will accept no returns on electrical products, special order items, and tools, except for warranty replacement.Ĭustomer is subject to a 15% restocking fee for returns resulting from customer error.ĭefective items will be replaced or credited. Returns will be accepted only from the customer directly. ![]() Returns received directly from 3rd parties may be returned to sender at customer's cost. All returns are subject to a 15% restocking fee. All products to be returned must have a copy of the original invoice issued by 944online and must be shipped prepaid within 30 days of receipt of the order.Īll returned products must be accompanied by the original invoice or pick pack and be unused, resalable (unless damaged or defective) and still in the original, undamaged package and purchased within the last 30 days. If damage or loss of merchandise has resulted from handling during transportation, you must make a claim directly with the delivery carrier. Customer must notify 944online, within 24 hours after receipt of each shipment, any shortage, wrong parts, damage, and loss of products delivered.
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