International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 12 Issue: 06 | Jun 2025
p-ISSN: 2395-0072
www.irjet.net
A Critical Analysis of Aerodynamic Design Impact on Fuel Efficiency for Vehicles on Indian Roads: A CFD-Based Study Shaurya Godha1 1Teoler High School, Jaipur, Rajasthan, India
---------------------------------------------------------------------***--------------------------------------------------------------------1.1 Objectives Abstract - This paper presents a comprehensive analysis of aerodynamic drag effects on fuel efficiency for popular vehicles on Indian roads through Computational Fluid Dynamics (CFD) simulations. Three widely-used vehicles Hyundai Creta, Maruti WagonR, and Swift Dzire - were analyzed to determine drag coefficients and their impact on fuel consumption at typical Indian driving speeds. The study reveals that at common urban speeds of 40-60 km/h, aerodynamic improvements yield minimal fuel efficiency gains of only 0.3-0.4 L/100km between the most and least aerodynamic vehicles. Given the predominance of low-speed driving conditions, frequent idling in traffic, and mechanical losses in Indian driving scenarios, the paper concludes that focusing on vehicle weight reduction, transmission efficiency, and engine optimization provides significantly better returns on fuel economy than aerodynamic refinements. This finding challenges the conventional emphasis on aerodynamic design for the Indian automotive market and suggests a reorientation of engineering priorities toward mechanical efficiency improvements.
This study aims to: - Quantify the impact of aerodynamic drag on fuel consumption for popular Indian vehicles - Analyze the relationship between vehicle speed and aerodynamic losses in Indian driving conditions - Compare aerodynamic improvements with alternative fuel-saving strategies - Provide evidence-based recommendations for vehicle design priorities in the Indian context 1.2 Scope
Analysis, Indian Roads, Drag Coefficient, Vehicle Design, Fuel Economy
The analysis focuses on three representative vehicles from different segments: Hyundai Creta (compact SUV), Maruti WagonR (hatchback), and Swift Dzire (sedan). CFD simulations were conducted to determine drag coefficients, followed by calculations of power requirements and fuel consumption impacts at various speeds typical of Indian roads.
1.INTRODUCTION
2. LITERATURE REVIEW
The Indian automotive market presents unique challenges for vehicle design optimization. With increasing fuel prices and environmental concerns, manufacturers are exploring various strategies to improve fuel efficiency. While aerodynamic design has been a primary focus in developed markets with high-speed highway networks, the applicability of such strategies in the Indian context requires critical examination.
Extensive research has been conducted on vehicle aerodynamics and fuel efficiency globally. Hucho (2013) established that aerodynamic drag increases with the square of velocity, making it the dominant resistance force at high speeds. However, Sovran and Blaser (2003) noted that at speeds below 50 km/h, rolling resistance and mechanical losses constitute over 60% of total vehicle resistance.
Key Words: Aerodynamics, Fuel Efficiency, CFD
Studies specific to Indian driving conditions reveal unique patterns. Bandivadekar and Gunter (2008) found that Indian vehicles spend approximately 35% of their operational time idling in traffic, contributing to 15-20% of total fuel consumption. This idling component remains unaffected by aerodynamic improvements. Similarly, Guttikunda and Mohan (2014) reported that stop-and-go traffic in Indian cities results in fuel consumption patterns where acceleration losses dominate, accounting for up to 40% of urban fuel use.
Indian road conditions are characterized by dense urban traffic, frequent stops, lower average speeds, and mixed traffic patterns. The National Highway Authority of India reports that average speeds on Indian highways rarely exceed 80 km/h, with urban speeds typically ranging between 20-40 km/h during peak hours. This stark contrast to Western driving conditions, where highway speeds of 100-130 km/h are common, raises questions about the prioritization of aerodynamic optimization for the Indian market.
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International research on low-speed driving efficiency supports these findings. Mock et al. (2012) demonstrated that weight reduction of 100 kg typically saves 0.3-0.5 L/100km
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